[wiki migration] Framework team pages (#148721)

This sorts the wiki pages owned by the Framework team in the docs/ directory as planned in [flutter.dev/go/migrate-flutter-wiki-spreadsheet](https://docs.google.com/spreadsheets/d/1x65189ZBdNiLRygpUYoU08pwvXD4M-Z157c6pm8deGI/edit?usp=sharing) 

It also adds the framework related labels to the bot for future PRs.

Changes to the content were only updating cross links. The remaining wiki links will be updated after the rest of the pages are relocated, the original wiki links still work in the meantime.

Part of https://github.com/flutter/flutter/issues/145009

.github/labeler.yml

@@ -63,6 +63,7 @@ engine:
     - any-glob-to-any-file:
       - '**/cupertino/*'
       - '**/*cupertino*'
+      - docs/libraries/cupertino/**/*
 
 'f: focus':
   - changed-files:
@@ -81,6 +82,7 @@ engine:
     - any-glob-to-any-file:
       - '**/material/*'
       - '**/*material*'
+      - docs/libraries/material/**/*
 
 'f: routes':
   - changed-files:
@@ -110,6 +112,8 @@ framework:
       - packages/flutter_test/**/*
       - packages/integration_test/**/*
       - examples/api/**/*
+      - docs/contributing/**/*
+      - docs/libraries/**/*
 
 'f: integration_test':
   - changed-files: