Wclaer/update notebooks - #83

Once the build has completed, you can preview your PR at this URL: https://Kermit-UGent.github.io/ModSim/previews/PR83/

Things still to implement in later PRs

• precompile intro notebooks
• update academic year and collaborators
• create a pre-release
• Add folders per practical

Things still to implement in later PRs

* [ ]  precompile intro notebooks
* [ ]  update academic year and collaborators
* [ ]  create a pre-release

Additional suggestions:

• Make a collapsible header for every practical in the sidebar (and subsequently shorten notebook names)
• Either update or remove semester at end of sidebar
• Add more example projects