It looks like you put all the files in the repo root, they should probably be somewhere in doc/

Question: is it a good idea to have the Sphinx theme in here? I'm not sure either way, it's just something I hadn't expected here. In my mind the workflow would be: review notebooks here with reviewnb, merge, deal with Sphinx integration over in the main repo.

Doing it here may be nicer, to be able to iterate without triggering the large battery of CI in the main repo. Would be good to lay out the workflow though - we want to avoid tightly coupling new notebook tutorial PRs to dealing with Sphinx-ifying.

I'm closing this PR as in discussions with the Docs Team we figured having MyST-NB might be a better approach, as it would be simpler for users to build the notebooks and contribute to the repo. I'll follow up with a new PR after I have this figured out.