Complete comprehensive platform-specific documentation

- Fix README files to properly reference platform-specific guides
- Add Notion White-Label frontend implementation guide
- Clean up duplicate platform-specific examples sections
- All documentation now includes proper cross-references to platform-specific guides
- Complete the comprehensive documentation structure for all guide sections

Co-Authored-By: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

docs/frontend-implementation/white-label/README.md

@@ -392,8 +392,8 @@ export default function MultiPlatformConnector() {
 
 For detailed platform-specific frontend implementation examples:
 
-- [Google Drive Frontend Implementation](./google-drive.md) (already exists)
-- [Dropbox Frontend Implementation](./dropbox.md) (already exists)
+- [Google Drive Frontend Implementation](./google-drive.md)
+- [Dropbox Frontend Implementation](./dropbox.md)
 - [Notion Frontend Implementation](./notion.md)
 
 ## Next Steps

docs/testing/white-label/README.md

@@ -412,8 +412,8 @@ npm test -- --coverage
 
 For detailed platform-specific testing examples:
 
-- [Google Drive Testing](./google-drive.md) (already exists)
-- [Dropbox Testing](./dropbox.md) (already exists)
+- [Google Drive Testing](./google-drive.md)
+- [Dropbox Testing](./dropbox.md)
 - [Notion Testing](./notion.md)
 
 ## Next Steps