Switching the frontend to JupyterLab

[dokempf]

This is a long-term issue tracking the progress towards making JupyterLab the default frontend of the material. It is continuously udpated when new problems arise.

Technically, switching to JupyterLab is easy: Starting jupyter lab instead of jupyter notebook (after install the jupyterlab package) does the trick. There are however some minor and major complications:

Major things to take care of (blockers for the transition):

• Increase the size of the Doxygen documentation - it gets rendered inline and is very small.
• Make sure that the exercise/solution extension we use is compatible with JupyterLab

Here are some minor things to fix when transitioning:

• Make the Docker image use Jupyter Lab
• The VTKWriter rich display link does not work, as it tries to open the file within JupyterLab - which is unsupported.

[dokempf]

Upstream issue opened for the documentation iframe: jupyter-xeus/xeus-cling#399