[docs] Fix experimental API page duplication (mui#35213)

docs/data/material/experimental-api/css-theme-variables/customization.md

@@ -1,4 +1,4 @@
-# Customization
+# CSS theme variables - Customization
 
 <p class="description">A guide for customizing CSS theme variables in Material UI.</p>
 

docs/data/material/experimental-api/css-theme-variables/migration.md

@@ -1,4 +1,4 @@
-# Migrating to CSS variables
+# Migrating to CSS theme variables
 
 <p class="description">A step-by-step migration guide to start using CSS theme variables in your project.</p>
 

docs/data/material/experimental-api/css-theme-variables/overview.md

@@ -28,8 +28,8 @@ For server-side applications, there are some trade-offs to consider:
 
 |                                                      | Compare to the default method | Reason                                                                                                       |
 | ---------------------------------------------------- | ----------------------------- | ------------------------------------------------------------------------------------------------------------ |
-| HTML size                                            | bigger                        | CSS variables are generated for both light and dark mode at build time.                                      |
-| [First Contentful Paint (FCP)](https://web.dev/fcp/) | larger                        | Since the HTML size is generally bigger, the time to download the HTML before showing the content is longer. |
+| HTML size                                            | Bigger                        | CSS variables are generated for both light and dark mode at build time.                                      |
+| [First Contentful Paint (FCP)](https://web.dev/fcp/) | Larger                        | Since the HTML size is generally bigger, the time to download the HTML before showing the content is longer. |
 | [Time to Interactive (TTI)](https://web.dev/tti/)    | Smaller (for dark mode)       | Stylesheets are not regenerated between light and dark mode, so it takes less time for JavaScript to run.    |
 
 :::warning

docs/data/material/experimental-api/css-theme-variables/usage.md

@@ -1,4 +1,4 @@
-# Usage
+# CSS theme variables - Usage
 
 <p class="description">Learn how to use the experimental APIs to adopt CSS theme variables.</p>
 

docs/data/material/experimental-api/css-variables/css-variables.md

@@ -1,4 +1,4 @@
-# CSS variables
+# TODO merge with other pages
 
 <p class="description">Learn about the experimental API for using CSS variables with Material UI components.</p>
 

docs/data/material/pages.ts

@@ -230,7 +230,11 @@ const pages: MuiPage[] = [
           { pathname: '/material-ui/experimental-api/css-theme-variables/customization' },
           {
             pathname: '/material-ui/experimental-api/css-theme-variables/migration',
-            title: 'Migrating to CSS theme variables',
+            title: 'Migrating to CSS variables',
+          },
+          {
+            pathname: '/material-ui/experimental-api/css-variables',
+            title: 'TODO merge with other pages',
           },
         ],
       },

docs/public/_redirects

@@ -378,18 +378,28 @@ https://v4.material-ui.com/* https://v4.mui.com/:splat 301!
 /:lang/joy-ui/core-features/global-variant/ /:langjoy-ui/main-features/global-variants/ 301
 /joy-ui/core-features/automatic-adjustment/ /joy-ui/main-features/automatic-adjustment/ 301
 /:lang/joy-ui/core-features/automatic-adjustment/ /:lang/joy-ui/main-features/automatic-adjustment/ 301
-/joy-ui/core-features/perfect-dark-mode/ /joy-ui/main-features/perfect-dark-mode/ 301
-/:lang/joy-ui/core-features/perfect-dark-mode/ /:lang/joy-ui/main-features/perfect-dark-mode/ 301
+/joy-ui/core-features/perfect-dark-mode/ /joy-ui/main-features/dark-mode-optimization/ 301
+/:lang/joy-ui/core-features/perfect-dark-mode/ /:lang/joy-ui/main-features/dark-mode-optimization/ 301
 /system/basics/ /system/getting-started/overview/ 301
+/:lang/system/basics/ /:lang/system/getting-started/overview/ 301
 /system/the-sx-prop/ /system/getting-started/the-sx-prop/ 301
+/:lang/system/the-sx-prop/ /:lang/system/getting-started/the-sx-prop/ 301
 /system/advanced/ /system/getting-started/custom-components/ 301
-/:lang/base/react-trap-focus/ /:lang/base/react-focus-trap/ 301
-/:lang/base/api/trap-focus/ /:lang/base/api/focus-trap/ 301
+/:lang/system/advanced/ /:lang/system/getting-started/custom-components/ 301
 /base/react-trap-focus/ /base/react-focus-trap/ 301
+/:lang/base/react-trap-focus/ /:lang/base/react-focus-trap/ 301
 /base/api/trap-focus/ /base/api/focus-trap/ 301
+/:lang/base/api/trap-focus/ /:lang/base/api/focus-trap/ 301
 /material-ui/experimental-api/css-variables/ /material-ui/experimental-api/css-theme-variables/overview/ 301
+/:lang/material-ui/experimental-api/css-variables/ /:lang/material-ui/experimental-api/css-theme-variables/overview/ 301
 /joy-ui/main-features/perfect-dark-mode/ /joy-ui/main-features/dark-mode-optimization/ 301
+/:lang/joy-ui/main-features/perfect-dark-mode/ /:lang/joy-ui/main-features/dark-mode-optimization/ 301
 /joy-ui/guides/applying-dark-mode/ /joy-ui/customization/dark-mode/ 301
+/:lang/joy-ui/guides/applying-dark-mode/ /:lang/joy-ui/customization/dark-mode/ 301
+/experimental-api/classname-generator/ /material-ui/experimental-api/classname-generator/ 301
+/:lang/experimental-api/classname-generator/ /:lang/material-ui/experimental-api/classname-generator/ 301
+/experimental-api/css-variables/ /material-ui/experimental-api/css-theme-variables/overview/ 301
+/:lang/experimental-api/css-variables/ /:lang/material-ui/experimental-api/css-theme-variables/overview/ 301
 # 2023
 
 # Proxies

docs/src/pages.ts

@@ -280,15 +280,6 @@ const pages: readonly MuiPage[] = [
       { pathname: '/guides/flow' },
     ],
   },
-  {
-    pathname: '/experimental-api',
-    title: 'Experimental APIs',
-    icon: 'ExperimentIcon',
-    children: [
-      { pathname: '/experimental-api/classname-generator', title: 'ClassName generator' },
-      { pathname: '/experimental-api/css-variables', title: 'CSS variables' },
-    ],
-  },
   {
     pathname: '/styles',
     title: 'Styles',

docs/translations/translations.json

@@ -345,7 +345,8 @@
     "/material-ui/experimental-api/css-theme-variables/overview": "Overview",
     "/material-ui/experimental-api/css-theme-variables/usage": "Usage",
     "/material-ui/experimental-api/css-theme-variables/customization": "Customization",
-    "/material-ui/experimental-api/css-theme-variables/migration": "Migrating to CSS theme variables",
+    "/material-ui/experimental-api/css-theme-variables/migration": "Migrating to CSS variables",
+    "/material-ui/experimental-api/css-variables": "TODO merge with other pages",
     "/material-ui/discover-more": "Discover more",
     "/material-ui/discover-more/showcase": "Showcase",
     "/material-ui/discover-more/related-projects": "Related projects",