Follow-up from "Infrastructure for notebooks in Sphinx docs"

The following discussion from !25 (merged) should be addressed:

• @chleh started a discussion: (+3 comments)

  I'm not sure about that.

  Today I learned that Jupyter can start a kernel in a specific virtual environment: https://www.geeksforgeeks.org/using-jupyter-notebook-in-virtual-environment/

  Maybe that's a better way to go instead of installing jupyter in every virtual env separately.

Solution: Install jupyterlab in docs environment.