Attempt at porting dalejung/nbx over the version 7 of notebook.
Porting to Notebook 7 FE seems like a deadend atm. Trying nbclassic
https://github.com/dalejung/nbclassic/tree/nbx_patch
cd nbx_deux/nbextensions
jupyter nbclassic-extension install --symlink --user ./nbx-vim
jupyter nbclassic-extension enable nbx-vim/vim --user
jupyter nbclassic-extension install --symlink --user ./nbx-gist
jupyter nbclassic-extension enable nbx-gist/gist --user