Jupyterhub - customize user environment

[mfreeman451]

https://z2jh.jupyter.org/en/stable/jupyterhub/customization.html

I think in order to have our environment variables, we need to create a custom docker image. Also we want these notebooks to be sync'ed to our github, I think we need to use a tool called https://nbgitpuller.readthedocs.io/en/latest/ but maybe there are other choices. The driver for the environment variables is to be able to put things like passwords/keys to APIs in there and they would be available to anyone of us running jupyter notebook experiments.

• Custom Docker Image
• Environment Variables
• LSP server
• Sync'd with GitHub

[mfreeman451]

dup of #56