GitHub loader extension + extension support v1 (#469)

* feat: implement github repo loading
fix: purge of folders
fix: rendering of sub-files

* noshow delete on custom-documents

* Add API key support because of rate limits

* WIP for frontend of data connectors

* wip

* Add frontend form for GitHub repo data connector

* remove console.logs
block custom-documents from being deleted

* remove _meta unused arg

* Add support for ignore pathing in request
Ignore path input via tagging

* Update hint