Move legacy platform-specific documentation to legacy-docs folder

- Move docs/google-drive/ and docs/dropbox/ folders to docs/legacy-docs/ - Update reference in general-guide.md to point to new legacy-docs paths - Preserve new step-based documentation structure (creating-connectors/, authentication/, etc.) - Mark legacy guides as deprecated in favor of step-based approach Co-Authored-By: dikshant.pradhan@vectorize.io <dikshant.pradhan@vectorize.io>

Author: devin-ai-integration[bot]

docs/general-guide.md

@@ -90,6 +90,5 @@ For specific platform integrations, refer to the step-based documentation struct
 - [Testing](./testing/white-label/README.md)
 
 ### Legacy Platform-Specific Guides (Deprecated)
-- [Google Drive Integration](./google-drive/) - Use step-based guides instead
-- [Dropbox Integration](./dropbox/) - Use step-based guides instead
-- [Setup Guide](./setup.md)
+- [Google Drive Integration](./legacy-docs/google-drive/) - Use step-based guides instead
+- [Dropbox Integration](./legacy-docs/dropbox/) - Use step-based guides instead