diff --git a/doc/_static/pocoo.png b/doc/_static/pocoo.png
deleted file mode 100644
index 1648bb8d74e..00000000000
Binary files a/doc/_static/pocoo.png and /dev/null differ
diff --git a/doc/_templates/contents.html b/doc/_templates/contents.html
new file mode 100644
index 00000000000..003d8c3d75b
--- /dev/null
+++ b/doc/_templates/contents.html
@@ -0,0 +1,6 @@
+{% extends "layout.html" %}
+{% set title = _('Sphinx documentation contents') %}
+{% block body %}
+<h1>{{ _('Sphinx documentation contents') }}</h1>
+{{ toctree(includehidden=True, collapse=False, maxdepth=3) }}
+{% endblock %}
diff --git a/doc/_templates/index.html b/doc/_templates/index.html
deleted file mode 100644
index 3cb884ab77e..00000000000
--- a/doc/_templates/index.html
+++ /dev/null
@@ -1,129 +0,0 @@
-{% extends "layout.html" %}
-{% set title = _('Overview') %}
-{% block body %}
-  <h1>{{ _('Welcome') }}</h1>
-
-  <div class="quotebar">
-    <p><em>{%trans%}What users say:{%endtrans%}</em></p>
-    <p>{%trans%}&#8220;Cheers for a great tool that actually makes programmers <b>want</b>
-      to write documentation!&#8220;{%endtrans%}</p>
-  </div>
-
-  <p>{%trans%}
-    Sphinx is a tool that makes it easy to create intelligent and beautiful
-    documentation, written by Georg Brandl and licensed under the BSD license.{%endtrans%}</p>
-  <p>{%trans%}It was originally created for <a href="https://docs.python.org/">the
-    Python documentation</a>, and it has excellent facilities for the
-    documentation of software projects in a range of languages.  Of
-    course, this site is also created from reStructuredText sources using
-    Sphinx!  The following features should be highlighted:{%endtrans%}
-  </p>
-  <ul>
-    <li>{%trans%}<b>Output formats:</b> HTML (including Windows HTML Help), LaTeX (for
-      printable PDF versions), ePub, Texinfo, manual pages, plain text{%endtrans%}</li>
-    <li>{%trans%}<b>Extensive cross-references:</b> semantic markup and automatic links
-      for functions, classes, citations, glossary terms and similar pieces of
-      information{%endtrans%}</li>
-    <li>{%trans%}<b>Hierarchical structure:</b> easy definition of a document tree, with
-      automatic links to siblings, parents and children{%endtrans%}</li>
-    <li>{%trans%}<b>Automatic indices:</b> general index as well as a language-specific
-      module indices{%endtrans%}</li>
-    <li>{%trans%}<b>Code handling:</b> automatic highlighting using the <a
-      href="https://pygments.org">Pygments</a> highlighter{%endtrans%}</li>
-    <li>{%trans path=pathto('ext/builtins')%}<b>Extensions:</b> automatic testing of code snippets, inclusion of
-      docstrings from Python modules (API docs), and
-      <a href="{{ path }}#builtin-sphinx-extensions">more</a>{%endtrans%}</li>
-    <li>{%trans path=pathto("usage/extensions/index")%}<b>Contributed extensions:</b> dozens of
-      extensions <a href="{{ path }}#third-party-extensions">contributed by users</a>;
-      most of them installable from PyPI{%endtrans%}</li>
-  </ul>
-  <p>{%trans%}
-    Sphinx uses <a href="https://docutils.sourceforge.io/rst.html">reStructuredText</a>
-    as its markup language, and many of its strengths come from the power and
-    straightforwardness of reStructuredText and its parsing and translating
-    suite, the <a href="https://docutils.sourceforge.io/">Docutils</a>.{%endtrans%}
-  </p>
-
-  <h2 style="margin-bottom: 0">{%trans%}Documentation{%endtrans%}</h2>
-
-  <table class="contentstable">
-    <tr>
-      <td>
-        <p class="biglink"><a class="biglink" href="{{ pathto("usage/quickstart") }}">{%trans%}First steps with Sphinx{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}overview of basic tasks{%endtrans%}</span></p>
-      </td><td>
-        <p class="biglink"><a class="biglink" href="{{ pathto("tutorial/index") }}">{%trans%}Tutorial{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}beginners tutorial{%endtrans%}</span></p>
-      </td>
-    </tr><tr>
-      <td>
-        <p class="biglink"><a class="biglink" href="{{ pathto("contents") }}">{%trans%}Contents{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}for a complete overview{%endtrans%}</span></p>
-      </td><td>
-        {%- if hasdoc('search') %}<p class="biglink"><a class="biglink" href="{{ pathto("search") }}">{%trans%}Search page{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}search the documentation{%endtrans%}</span></p>{%- endif %}
-      </td>
-    </tr><tr>
-      <td>
-        <p class="biglink"><a class="biglink" href="{{ pathto("changes") }}">{%trans%}Changes{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}release history{%endtrans%}</span></p>
-      </td><td>
-        {%- if hasdoc('genindex') %}<p class="biglink"><a class="biglink" href="{{ pathto("genindex") }}">{%trans%}General Index{%endtrans%}</a><br/>
-           <span class="linkdescr">{%trans%}all functions, classes, terms{%endtrans%}</span></p>{%- endif %}
-      </td><td>
-    </tr>
-  </table>
-
-  <p>{%trans%}
-    You can also download PDF/EPUB versions of the Sphinx documentation
-    from pop up menu on lower right corner.{%endtrans%}
-  </p>
-
-  <h2>{%trans%}Examples{%endtrans%}</h2>
-  <p>{%trans path=pathto("examples")%}Links to documentation generated with Sphinx can be found on the
-    <a href="{{ path }}">Projects using Sphinx</a> page.{%endtrans%}
-  </p>
-  <p>{%trans%}
-    For examples of how Sphinx source files look, use the &#8220;Show
-    source&#8221; links on all pages of the documentation apart from this
-    welcome page.{%endtrans%}
-  </p>
-
-  <p>{%trans%}You may also be interested in the very nice
-    <a href="http://matplotlib.sourceforge.net/sampledoc/">tutorial</a> on how to
-    create a customized documentation using Sphinx written by the matplotlib
-    developers.{%endtrans%}</p>
-
-  <p>{%trans%}There is a translation team in <a href="https://www.transifex.com/sphinx-doc/sphinx-doc/dashboard/">Transifex</a>
-    of this documentation, thanks to the Sphinx document translators.{%endtrans%}</p>
-  <p>{%trans%}A Japanese book about Sphinx has been published by O'Reilly:
-    <a href="https://www.oreilly.co.jp/books/9784873116488/">Sphinxをはじめよう /
-      Learning Sphinx</a>.{%endtrans%}</p>
-  <p>{%trans%}In 2019 the second edition of a German book about Sphinx was published:
-    <a href="https://literatur.hasecke.com/post/software-dokumentation-mit-sphinx/">Software-Dokumentation mit Sphinx</a>.{%endtrans%}</p>
-  <!-- <p><img src="{{ pathto("_static/bookcover.png", 1) }}"/></p> -->
-
-
-  <h2>{%trans%}Hosting{%endtrans%}</h2>
-
-  <p>{%trans%}Need a place to host your Sphinx docs?
-    <a href="https://readthedocs.org/">readthedocs.org</a> hosts a lot of Sphinx docs
-    already, and integrates well with projects' source control.  It also features a
-    powerful built-in search that exceeds the possibilities of Sphinx' JavaScript-based
-    offline search.{%endtrans%}</p>
-
-  <h2>{%trans%}Contributor Guide{%endtrans%}</h2>
-
-  <p>{%trans%}If you want to contribute to the project,
-    this part of the documentation is for you.{%endtrans%}</p>
-
-    <ul>
-      <li>{%trans path=pathto("internals/contributing")%}<a href="{{ path }}">Sphinx Contributors’ Guide</a></li>{%endtrans%}
-      <li>{%trans path=pathto("internals/authors")%}<a href="{{ path }}">Sphinx Authors</a></li>{%endtrans%}
-    </ul>
-
-  <h2>{%trans%}Code of Conduct{%endtrans%}</h2>
-
-  <p>{%trans path=pathto("internals/code-of-conduct")%}Please adhere to our <a href="{{ path }}">Code of Conduct</a>.{%endtrans%}</p>
-
-{% endblock %}
diff --git a/doc/_templates/indexsidebar.html b/doc/_templates/indexsidebar.html
deleted file mode 100644
index e765648b2e7..00000000000
--- a/doc/_templates/indexsidebar.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<p class="logo">A <a href="https://www.pocoo.org/">
-  <img src="{{ pathto("_static/pocoo.png", 1) }}" alt="Pocoo" /></a>
-  {%trans%}project{%endtrans%}</p>
-
-<h3>Download</h3>
-<p class="download">{%trans%}Current version: <a href="https://pypi.org/project/Sphinx/" alt="PyPI"><img src="https://img.shields.io/pypi/v/sphinx.svg"></a>{%endtrans%}</p>
-<p>{%trans%}Install Sphinx with:{%endtrans%}</p>
-<pre>pip install -U Sphinx</pre>
-
-<h3>{%trans%}Questions? Suggestions?{%endtrans%}</h3>
-
-<p>{%trans%}Join the <a href="https://groups.google.com/group/sphinx-users">sphinx-users</a> mailing list on Google Groups:{%endtrans%}</p>
-<div class="subscribeformwrapper">
-<form action="https://groups.google.com/group/sphinx-users/boxsubscribe"
-      class="subscribeform">
-  <input type="text" name="email" value="your@email"
-         onfocus="this.value = ''" />
-  <input type="submit" name="sub" value="Subscribe" />
-</form>
-</div>
-<p>{%trans%}or come to the <tt>#sphinx-doc</tt> channel on <a href="https://web.libera.chat/?channel=#sphinx-doc">libera.chat</a>.{%endtrans%}</p>
-<p>{%trans%}You can also open an issue at the
-  <a href="https://github.com/sphinx-doc/sphinx/issues">tracker</a>.{%endtrans%}</p>
diff --git a/doc/_themes/sphinx13/layout.html b/doc/_themes/sphinx13/layout.html
index 7fe550ebde2..f6f858a57d5 100644
--- a/doc/_themes/sphinx13/layout.html
+++ b/doc/_themes/sphinx13/layout.html
@@ -1,75 +1,60 @@
-{#
-    sphinxdoc/layout.html
-    ~~~~~~~~~~~~~~~~~~~~~
-
-    Sphinx layout template for the sphinxdoc theme.
-
-    :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-#}
+{# Sphinx layout template for the sphinxdoc theme. #}
 {%- extends "basic/layout.html" %}
 
-{# put the sidebar before the body #}
-{% block sidebar1 %}{{ sidebar() }}{% endblock %}
-{% block sidebar2 %}{% endblock %}
-
 {% block extrahead %}
-    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,700'
-          rel='stylesheet' type='text/css' />
 {{ super() }}
-{%- if not embedded %}
-    <style type="text/css">
-      table.right { float: right; margin-left: 20px; }
-      table.right td { border: 1px solid #ccc; }
-      {% if pagename == 'index' %}
-      .related { display: none; }
-      {% endif %}
-    </style>
-    <script>
-      // intelligent scrolling of the sidebar content
-      window.onscroll = () => {
-        const sb = document.getElementsByClassName('sphinxsidebarwrapper')[0]
-        const sbh = sb.offsetHeight
-        const offset = document.getElementsByClassName('sphinxsidebar')[0].offsetTop;
-        const wintop = window.scrollTop;
-        const winbot = wintop + window.offsetHeight
-        const curtop = sb.offsetTop;
-        const curbot = curtop + sbh;
-        // does sidebar fit in window?
-        if (sbh < window.offsetHeight) {
-          // yes: easy case -- always keep at the top
-          sb.style.top = Math.min(Math.max(0, wintop - offset - 10), window.innerHeight - sbh - 200)
-        } else {
-          // no: only scroll if top/bottom edge of sidebar is at
-          // top/bottom edge of window
-          if (curtop > wintop && curbot > winbot) {
-              sb.style.top = Math.max(wintop - offset - 10, 0)
-          } else if (curtop < wintop && curbot < winbot) {
-              sb.style.top = Math.min(winbot - sbh - offset - 20, window.innerHeight - sbh - 200)
-          }
-        }
-      }
-    </script>
+{%- if not embedded and pagename == 'index' %}
+<style>.related { display: none; }</style>
 {%- endif %}
 {% endblock %}
 
-{% block rootrellink %}
-        <li><a href="{{ pathto('index') }}">Sphinx home</a>&#160;|</li>
-        <li><a href="{{ pathto('contents') }}">Documentation</a> &#187;</li>
-{% endblock %}
-
 {% block header %}
 <div class="pageheader">
+<a href="{{ pathto('index') }}">
+  <img src="{{ pathto('_static/sphinxheader.png', 1) }}" alt="SPHINX" />
+</a>
+</div>
+{% endblock %}
+
+{%- block relbar1 %}
+<div class="related" role="navigation" aria-label="related navigation">
+  <h3>{{ _('Navigation') }}</h3>
   <ul>
-    <li><a href="{{ pathto('index') }}">Home</a></li>
-    <li><a href="{{ pathto('usage/installation') }}">Get it</a></li>
-    <li><a href="{{ pathto('contents') }}">Docs</a></li>
-    <li><a href="{{ pathto('development/index') }}">Extend</a></li>
+    <li><a href="{{ pathto('index') }}">Documentation</a> &raquo;</li>
+    {%- for parent in parents %}
+      <li class="nav-item nav-item-{{ loop.index }}"><a href="{{ parent.link|e }}" {% if loop.last %}{{ accesskey("U") }}{% endif %}>{{ parent.title }}</a>{{ reldelim1 }}</li>
+    {%- endfor %}
+    <li class="nav-item nav-item-this"><a href="{{ link|e }}">{{ title }}</a></li>
   </ul>
+</div>
+{% endblock %}
+
+{%- block content %}
+<div class="document">
+  <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+  {%- include "searchbox.html" %}
   <div>
-    <a href="{{ pathto('index') }}">
-      <img src="{{ pathto('_static/sphinxheader.png', 1) }}" alt="SPHINX" />
-    </a>
+    <h3>{{ _('Contents') }}</h3>
+    {%- if pagename != "index" %}
+      {{ toc }}
+    {%- else %}
+      {{ toctree(includehidden=True, maxdepth=3) }}
+    {%- endif %}
+  </div>
+  </div>
+  {%- block document %}
+  <div class="body" role="main">
+    {% block body %}{% endblock %}
   </div>
+  {%- endblock %}
 </div>
-{% endblock %}
+{%- endblock %}
+
+{%- block relbar2 %}{% endblock %}
+
+{%- block footer %}
+<div class="footer" role="contentinfo">
+  {% trans path=pathto('copyright'), copyright=copyright|e %}&#169; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
+  {% trans sphinx_version=sphinx_version|e %}Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> {{ sphinx_version }}.{% endtrans %}
+</div>
+{%- endblock %}
diff --git a/doc/_themes/sphinx13/static/bodybg.png b/doc/_themes/sphinx13/static/bodybg.png
deleted file mode 100644
index 6f667b99e1c..00000000000
Binary files a/doc/_themes/sphinx13/static/bodybg.png and /dev/null differ
diff --git a/doc/_themes/sphinx13/static/footerbg.png b/doc/_themes/sphinx13/static/footerbg.png
deleted file mode 100644
index d1bcb009b75..00000000000
Binary files a/doc/_themes/sphinx13/static/footerbg.png and /dev/null differ
diff --git a/doc/_themes/sphinx13/static/headerbg.png b/doc/_themes/sphinx13/static/headerbg.png
deleted file mode 100644
index 522504964d5..00000000000
Binary files a/doc/_themes/sphinx13/static/headerbg.png and /dev/null differ
diff --git a/doc/_themes/sphinx13/static/listitem.png b/doc/_themes/sphinx13/static/listitem.png
deleted file mode 100644
index f7f814d0021..00000000000
Binary files a/doc/_themes/sphinx13/static/listitem.png and /dev/null differ
diff --git a/doc/_themes/sphinx13/static/relbg.png b/doc/_themes/sphinx13/static/relbg.png
deleted file mode 100644
index 68a9b77eb74..00000000000
Binary files a/doc/_themes/sphinx13/static/relbg.png and /dev/null differ
diff --git a/doc/_themes/sphinx13/static/sphinx13.css b/doc/_themes/sphinx13/static/sphinx13.css
index 5d64eda512a..562b1757b6b 100644
--- a/doc/_themes/sphinx13/static/sphinx13.css
+++ b/doc/_themes/sphinx13/static/sphinx13.css
@@ -1,187 +1,74 @@
-/*
- * sphinx13.css
- * ~~~~~~~~~~~~
- *
- * Sphinx stylesheet -- sphinx13 theme.
- *
- * :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
- */
+/* Stylesheet for Sphinx's documentation */
 
-@import url("basic.css");
-
-/* -- page layout ----------------------------------------------------------- */
+/* Set master colours */
+:root {
+    --fonts-sans-serif: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
+    --colour-sphinx-blue: #0A507A;
+    --colour-text: #333;
+    --colour-links-light: #057;
+}
 
 body {
-    font-family: 'Open Sans', 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva',
-                 'Verdana', sans-serif;
-    font-size: 14px;
-    text-align: center;
-    background-image: url(bodybg.png);
-    color: black;
-    padding: 0;
-    border-right: 1px solid #0a507a;
-    border-left: 1px solid #0a507a;
-
+    font-family: var(--fonts-sans-serif);
     margin: 0 auto;
-    min-width: 780px;
-    max-width: 1080px;
+    color: var(--colour-text);
 }
 
 .pageheader {
-    background-image: url(headerbg.png);
-    text-align: left;
+    background-color: var(--colour-sphinx-blue);
     padding: 10px 15px;
 }
 
-.pageheader ul {
-    float: right;
-    color: white;
-    list-style-type: none;
-    padding-left: 0;
-    margin-top: 30px;
-    margin-right: 10px;
-}
-
-.pageheader li {
-    float: left;
-    margin: 0 0 0 10px;
-}
-
-.pageheader li a {
-    border-radius: 1px;
-    padding: 8px 12px;
-    color: #f9f9f0;
-    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
-}
-
-.pageheader li a:hover {
-    background-color: #f9f9f0;
-    color: #0a507a;
-    text-shadow: none;
-}
-
 div.document {
-    background-color: white;
-    text-align: left;
-}
-
-div.bodywrapper {
-    margin: 0 240px 0 0;
-    border-right: 1px solid #0a507a;
+    display: flex;
+    margin: 0 0.5em;
 }
 
 div.body {
+    border-left: 1px solid var(--colour-sphinx-blue);
     margin: 0;
-    padding: 0.5em 20px 20px 20px;
+    padding: 0.5em 1.25em;
+    min-width: 0;
+    max-width: 800px;
 }
 
 div.related {
-    font-size: 1em;
+    display: flex;
     color: white;
-}
-
-div.related ul {
-    background-image: url(relbg.png);
-    height: 1.9em;
+    background-color: var(--colour-sphinx-blue);
     border-top: 1px solid #002e50;
-    border-bottom: 1px solid #002e50;
 }
 
 div.related ul li {
     margin: 0 5px 0 0;
-    padding: 0;
     float: left;
 }
 
-div.related ul li.right {
-    float: right;
-    margin-right: 5px;
-}
-
 div.related ul li a {
-    margin: 0;
     padding: 0 5px 0 5px;
     line-height: 1.75em;
-    color: #f9f9f0;
-    text-shadow: 0px 0px 1px rgba(0, 0, 0, 0.5);
+    color: white;
 }
 
 div.related ul li a:hover {
-    color: white;
-    /*text-decoration: underline;*/
-    text-shadow: 0px 0px 1px rgba(255, 255, 255, 0.5);
+    text-shadow: 0 0 1px rgba(255, 255, 255, 0.5);
 }
 
 div.sphinxsidebarwrapper {
-    position: relative;
-    top: 0px;
     padding: 0;
 }
 
 div.sphinxsidebar {
+    overflow-wrap: break-word;
     margin: 0;
-    padding: 0 15px 15px 0;
+    padding-right: 15px;
     width: 210px;
-    float: right;
     font-size: 1em;
-    text-align: left;
-    max-height: 0px;
-}
-
-div.sphinxsidebar .logo {
-    font-size: 1.8em;
-    color: #0A507A;
-    font-weight: 300;
-    text-align: center;
-}
-
-div.sphinxsidebar .logo img {
-    vertical-align: middle;
-}
-
-div.sphinxsidebar .download a img {
-    vertical-align: middle;
-}
-
-div.subscribeformwrapper {
-    display: block;
-    overflow: auto;
-    margin-bottom: 1.2em;
-}
-
-div.sphinxsidebar input {
-    border: 1px solid #aaa;
-    font-family: 'Open Sans', 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva',
-                 'Verdana', sans-serif;
-}
-
-div.sphinxsidebar .subscribeform {
-    margin-top: 0;
-}
-
-div.sphinxsidebar .subscribeform input {
-    border: 1px solid #aaa;
-    font-size: 0.9em;
-    float: left;
-    padding: 0.25em 0.5em;
-    box-sizing: border-box;
-}
-
-div.sphinxsidebar .subscribeform input[type="text"] {
-    width: 60%;
-}
-
-div.sphinxsidebar .subscribeform input[type="submit"] {
-    width: 40%;
-    border-left: none;
 }
 
 div.sphinxsidebar h3 {
     font-size: 1.5em;
-    border-top: 1px solid #0a507a;
-    margin-top: 1em;
+    margin-top: 0;
     margin-bottom: 0.5em;
     padding-top: 0.5em;
 }
@@ -198,12 +85,6 @@ div.sphinxsidebar h3, div.sphinxsidebar h4 {
     padding-left: 14px;
     color: #333;
     font-weight: 300;
-    /*text-shadow: 0px 0px 0.5px rgba(0, 0, 0, 0.4);*/
-}
-
-div.sphinxsidebarwrapper > h3:first-child {
-    margin-top: 0.5em;
-    border: none;
 }
 
 div.sphinxsidebar h3 a {
@@ -219,17 +100,16 @@ div.sphinxsidebar ul {
 
 div.sphinxsidebar ul ul {
     margin-left: 20px;
-    list-style-image: url(listitem.png);
+    list-style-type: none;
 }
 
 div.footer {
-    background-image: url(footerbg.png);
+    background-color: var(--colour-sphinx-blue);
     color: #ccc;
     text-shadow: 0 0 .2px rgba(255, 255, 255, 0.8);
     padding: 3px 8px 3px 0;
     clear: both;
     font-size: 0.8em;
-    text-align: right;
 }
 
 /* no need to make a visible link to Sphinx on the Sphinx page */
@@ -244,14 +124,10 @@ p {
 }
 
 a {
-    color: #A2881D;
+    color: var(--colour-links-light);
     text-decoration: none;
 }
 
-a:hover {
-    color: #E1C13F;
-}
-
 div.body a {
     text-decoration: underline;
 }
@@ -259,12 +135,18 @@ div.body a {
 h1 {
     margin: 10px 0 0 0;
     font-size: 2.4em;
-    color: #0A507A;
+    color: var(--colour-sphinx-blue);
     font-weight: 300;
 }
 
+h1 span.pre {
+    /* for code in titles */
+    word-break: break-all;
+    white-space: normal;
+}
+
 h2 {
-    margin: 1.em 0 0.2em 0;
+    margin: 1em 0 0.2em 0;
     font-size: 1.5em;
     font-weight: 300;
     padding: 0;
@@ -282,12 +164,12 @@ div.body h1 a, div.body h2 a, div.body h3 a, div.body h4 a, div.body h5 a, div.b
 }
 
 div.body h1 a tt, div.body h2 a tt, div.body h3 a tt, div.body h4 a tt, div.body h5 a tt, div.body h6 a tt {
-    color: #0A507A !important;
+    color: var(--colour-sphinx-blue) !important;
     font-size: inherit !important;
 }
 
 a.headerlink {
-    color: #0A507A !important;
+    color: var(--colour-sphinx-blue) !important;
     font-size: 12px;
     margin-left: 6px;
     padding: 0 4px 0 4px;
@@ -308,7 +190,7 @@ h1 code, h2 code, h3 code, h4 code {
 cite, code, tt {
     font-family: 'Consolas', 'DejaVu Sans Mono',
                  'Bitstream Vera Sans Mono', monospace;
-    font-size: 14px;
+    font-size: 1em;
     letter-spacing: -0.02em;
 }
 
@@ -335,17 +217,13 @@ hr {
 
 a tt {
     border: 0;
-    color: #a2881d;
-}
-
-a tt:hover {
-    color: #e1c13f;
+    color: var(--colour-links-light);
 }
 
 pre {
     font-family: 'Consolas', 'Courier New', 'DejaVu Sans Mono',
                  'Bitstream Vera Sans Mono', monospace;
-    font-size: 13px;
+    font-size: 1em;
     letter-spacing: 0.015em;
     line-height: 120%;
     padding: 0.5em;
@@ -428,8 +306,7 @@ div.admonition div.highlight {
 }
 
 .viewcode-back {
-    font-family: 'Open Sans', 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva',
-                 'Verdana', sans-serif;
+    font-family: var(--fonts-sans-serif);
 }
 
 div.viewcode-block:target {
@@ -438,8 +315,15 @@ div.viewcode-block:target {
     border-bottom: 1px solid #ac9;
 }
 
-.contentstable {
-    margin-left: 30px;
-    margin: 0 auto;
-    table-layout: fixed;
+
+/* media queries */
+
+/* Reduce padding & margins for smaller screens */
+@media (max-width: 750px) {
+    .sphinxsidebar {
+        display: none;
+    }
+    div.body {
+        border-left: none;
+    }
 }
diff --git a/doc/_themes/sphinx13/theme.conf b/doc/_themes/sphinx13/theme.conf
index 19a480a6b36..78bb78f1013 100644
--- a/doc/_themes/sphinx13/theme.conf
+++ b/doc/_themes/sphinx13/theme.conf
@@ -1,4 +1,4 @@
 [theme]
 inherit = basic
-stylesheet = sphinx13.css
 pygments_style = default
+sidebars =
diff --git a/doc/conf.py b/doc/conf.py
index 2f504f699f7..1bcf5d559e1 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -2,6 +2,7 @@
 
 import os
 import re
+import time
 
 import sphinx
 
@@ -10,23 +11,25 @@
               'sphinx.ext.intersphinx',
               'sphinx.ext.viewcode', 'sphinx.ext.inheritance_diagram']
 
-root_doc = 'contents'
 templates_path = ['_templates']
 exclude_patterns = ['_build']
 
 project = 'Sphinx'
-copyright = '2007-2022, Georg Brandl and the Sphinx team'
+copyright = f'2007-{time.strftime("%Y")}, the Sphinx developers'
 version = sphinx.__display_version__
 release = version
 show_authors = True
 
 html_theme = 'sphinx13'
 html_theme_path = ['_themes']
+html_css_files = [
+    # 'basic.css',  # included through inheritance from the basic theme
+    'sphinx13.css',
+]
 modindex_common_prefix = ['sphinx.']
 html_static_path = ['_static']
-html_sidebars = {'index': ['indexsidebar.html', 'searchbox.html']}
 html_title = 'Sphinx documentation'
-html_additional_pages = {'index': 'index.html'}
+html_additional_pages = {'contents': 'contents.html'}
 html_use_opensearch = 'https://www.sphinx-doc.org/en/master'
 html_baseurl = 'https://www.sphinx-doc.org/en/master/'
 html_favicon = '_static/favicon.svg'
@@ -35,7 +38,7 @@
 
 epub_theme = 'epub'
 epub_basename = 'sphinx'
-epub_author = 'Georg Brandl'
+epub_author = 'the Sphinx developers'
 epub_publisher = 'https://www.sphinx-doc.org/'
 epub_uid = 'web-site'
 epub_scheme = 'url'
@@ -52,11 +55,10 @@
 epub_max_image_width = 0
 epub_show_urls = 'inline'
 epub_use_index = False
-epub_guide = (('toc', 'contents.xhtml', 'Table of Contents'),)
 epub_description = 'Sphinx documentation generator system manual'
 
-latex_documents = [('contents', 'sphinx.tex', 'Sphinx Documentation',
-                    'Georg Brandl', 'manual', 1)]
+latex_documents = [('index', 'sphinx.tex', 'Sphinx Documentation',
+                    'the Sphinx developers', 'manual', 1)]
 latex_logo = '_static/sphinx.png'
 latex_elements = {
     'fontenc': r'\usepackage[LGR,X2,T1]{fontenc}',
@@ -94,8 +96,8 @@
                       'directives.html#%s', '%s')}
 
 man_pages = [
-    ('contents', 'sphinx-all', 'Sphinx documentation generator system manual',
-     'Georg Brandl', 1),
+    ('index', 'sphinx-all', 'Sphinx documentation generator system manual',
+     'the Sphinx developers', 1),
     ('man/sphinx-build', 'sphinx-build', 'Sphinx documentation generator tool',
      '', 1),
     ('man/sphinx-quickstart', 'sphinx-quickstart', 'Sphinx documentation '
@@ -107,7 +109,7 @@
 ]
 
 texinfo_documents = [
-    ('contents', 'sphinx', 'Sphinx Documentation', 'Georg Brandl',
+    ('index', 'sphinx', 'Sphinx Documentation', 'the Sphinx developers',
      'Sphinx', 'The Sphinx documentation builder.', 'Documentation tools',
      1),
 ]
diff --git a/doc/contents.rst b/doc/contents.rst
deleted file mode 100644
index 21a27e233cb..00000000000
--- a/doc/contents.rst
+++ /dev/null
@@ -1,39 +0,0 @@
-.. _contents:
-
-Sphinx documentation contents
-=============================
-
-.. toctree::
-   :maxdepth: 2
-
-   usage/index
-   tutorial/index
-   development/index
-   man/index
-
-   templating
-   latex
-   extdev/index
-
-   internals/index
-
-   faq
-   glossary
-   changes
-   examples
-
-
-Indices and tables
-==================
-
-.. only:: builder_html
-
-   * :ref:`genindex`
-   * :ref:`modindex`
-   * :ref:`search`
-   * :ref:`glossary`
-
-.. only:: not builder_html
-
-   * :ref:`modindex`
-   * :ref:`glossary`
diff --git a/doc/index.rst b/doc/index.rst
new file mode 100644
index 00000000000..50571cdb70b
--- /dev/null
+++ b/doc/index.rst
@@ -0,0 +1,101 @@
+=======
+Welcome
+=======
+
+**Sphinx makes it easy to create intelligent and beautiful documentation.**
+
+Install
+=======
+
+Install Sphinx with ``pip install -U Sphinx``. See :doc:`usage/installation` for
+further details.
+
+Features
+========
+
+* **Output formats:** HTML (including Windows HTML Help), LaTeX (for printable
+  PDF versions), ePub, Texinfo, manual pages, plain text
+* **Extensive cross-references:** semantic markup and automatic links for
+  functions, classes, citations, glossary terms and similar pieces of
+  information
+* **Hierarchical structure:** easy definition of a document tree, with automatic
+  links to siblings, parents and children
+* **Automatic indices:** general index as well as a language-specific module
+  indices
+* **Code handling:** automatic highlighting using the Pygments_ highlighter
+* **Extensions:** automatic testing of code snippets, inclusion of docstrings
+  from Python modules (API docs), and :ref:`more <builtin-extensions>`
+* **Contributed extensions:** dozens of extensions
+  :ref:`contributed by users <third-party-extensions>`; most of them installable
+  from PyPI
+
+.. _Pygments: https://pygments.org/
+
+Sphinx uses reStructuredText_ as its markup language, and many of its strengths
+come from the power and straightforwardness of reStructuredText and its parsing
+and translating suite, the Docutils_.
+
+.. _reStructuredText: https://docutils.sourceforge.io/rst.html
+.. _Docutils: https://docutils.sourceforge.io/
+
+Documentation
+=============
+
+* :doc:`First steps with Sphinx <usage/quickstart>`: overview of basic tasks
+* :doc:`Tutorial <tutorial/index>`: beginners tutorial
+* :ref:`Search page <search>`: search the documentation
+* :doc:`Changes <changes>`: release history
+* :ref:`General Index <genindex>`: all functions, classes, terms
+* :ref:`Python Module Index <modindex>`: the index of Python modules
+* :doc:`Glossary <glossary>`: definitions of various terms
+* :doc:`Sphinx's Authors <internals/authors>`: the Sphinx developers
+* `Contents <contents.html>`__: full table of contents
+
+Support
+=======
+
+For questions or to report problems with Sphinx, join the `sphinx-users`_
+mailing list on Google Groups, come to the ``#sphinx-doc`` channel on
+`libera.chat`_, or open an issue at the tracker_.
+
+.. _sphinx-users: https://groups.google.com/group/sphinx-users
+.. _libera.chat: https://web.libera.chat/?channel=#sphinx-doc
+.. _tracker: https://github.com/sphinx-doc/sphinx/issues
+
+Examples of other projects using Sphinx can be found in the :doc:`examples page
+<examples>`. A useful tutorial_ has been written by the matplotlib developers.
+
+.. _tutorial: http://matplotlib.sourceforge.net/sampledoc/
+
+There is a translation team in Transifex_ of this documentation, thanks to the
+Sphinx document translators.
+
+.. _Transifex: https://www.transifex.com/sphinx-doc/sphinx-doc/dashboard/
+
+Contributor guide
+=================
+
+See the :doc:`Sphinx contributors' guide <internals/contributing>` if you would
+like to contribute to the project.
+
+.. master toctree:
+
+.. toctree::
+   :maxdepth: 5
+   :hidden:
+
+   usage/index
+   tutorial/index
+   development/index
+   man/index
+
+   templating
+   latex
+   extdev/index
+
+   internals/index
+
+   faq
+   glossary
+   changes
+   examples
diff --git a/doc/tutorial/end.rst b/doc/tutorial/end.rst
index ba96abca0d5..9f35b0752bf 100644
--- a/doc/tutorial/end.rst
+++ b/doc/tutorial/end.rst
@@ -2,5 +2,5 @@ Where to go from here
 =====================
 
 This tutorial covered the very first steps to create a documentation project
-with Sphinx.  To continue learning more about Sphinx, check out the :ref:`rest
-of the documentation <contents>`.
+with Sphinx.  To continue learning more about Sphinx, check out the `rest of the
+documentation <../contents.html>`__.
diff --git a/tox.ini b/tox.ini
index 549f002abd9..66421595528 100644
--- a/tox.ini
+++ b/tox.ini
@@ -75,7 +75,7 @@ description =
 extras =
     docs
 commands =
-    python -X dev -X warn_default_encoding -m sphinx -M html ./doc ./build/sphinx -W
+    python -X dev -X warn_default_encoding -m sphinx -M html ./doc ./build/sphinx -W --keep-going
 
 [testenv:docslint]
 basepython = python3