Try using RTD's default theme

docs/conf.py

@@ -92,18 +92,18 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+#html_theme = 'alabaster'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-html_theme_options = {
-    "github_user": "brettcannon",
-    "github_repo": "gidgethub",
-    "github_type": "star",
-    "github_banner": True,
-}
+#html_theme_options = {
+#    "github_user": "brettcannon",
+#    "github_repo": "gidgethub",
+#    "github_type": "star",
+#    "github_banner": True,
+#}
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,