Jupyter notebooks embedded in the GUI

[rizac]

Currently, Juopyter notebooks are linked from the GUI. This is fast and efficient *users are redirected to the page and can easily download the .ipynb file), but they cannot be inspected online, because the notebooks are not executed.

Workflow of how this could be nicely implemented:

1. In the egsim-init scripts, fetch the notebooks, execute them, convert to html.
2. Instead of links to the egsim-client page, show the HTML pages embedded in the GUI, adding a download button that will download the notebook
3. Keep this maintained every time a new PR is made on egsim-client => re-run egim-in it on the server