Moving migration guides to the release directory

firebase.json

@@ -101,7 +101,9 @@
       { "source": "/development/add-to-app/android/add-splash-screen", "destination": "/development/platform-integration/android/splash-screen", "type": 301 },
       { "source": "/development/ios-14", "destination": "/development/platform-integration/ios/ios-debugging", "type": 301 },
       { "source": "/development/ios-project-migration", "destination": "/development/platform-integration/ios", "type": 301 },
-      { "source": "/development/packages-and-plugins/androidx-compatibility", "destination": "/development/platform-integration/android/androidx-migration", "type": 301 },
+      { "source": "/development/platform-integration/android/androidx-migration", "destination": "/release/breaking-changes/androidx-migration", "type": 301 },
+      { "source": "/development/platform-integration/android/splash-screen-migration", "destination": "/release/breaking-changes/splash-screen-migration", "type": 301 },
+      { "source": "/testing/integration-tests/migration", "destination": "/release/breaking-changes/flutter-driver-migration", "type": 301 },
       { "source": "/development/packages-and-plugins/c-interop", "destination": "/development/platform-integration/android/c-interop", "type": 301 },
       { "source": "/development/packages-and-plugins/plugin-api-migration", "destination": "/release/breaking-changes/plugin-api-migration", "type": 301 },
       { "source": "/development/platform-integration/ios-app-clip", "destination": "/development/platform-integration/ios/ios-app-clip", "type": 301 },

src/_data/sidenav.yml

@@ -183,10 +183,6 @@
               permalink: /development/platform-integration/android/c-interop
             - title: Hosting native Android views
               permalink: /development/platform-integration/android/platform-views
-            - title: AndroidX migration
-              permalink: /development/platform-integration/android/androidx-migration
-            - title: Deprecated Splash Screen API Migration
-              permalink: /development/platform-integration/android/splash-screen-migration
             - title: Restore state on Android **NEW**
               permalink: /development/platform-integration/android/restore-state-android
             - title: Targeting ChromeOS with Android
@@ -370,8 +366,6 @@
     - title: Integration testing
       permalink: /testing/integration-tests
       match-page-url-exactly: true
-    - title: Migrating from flutter_driver
-      permalink: /testing/integration-tests/migration
 
 - title: Performance & optimization
   permalink: /perf