Fixed custom latex definitions errors

[ricvigi]

Fixed some custom latex definition errors across all notebooks. Also added fonts where needed

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[iacopomasi]

@ricvigi thanks for the update; it seems a very big one. I have seen that you uploaded also some personal material. Was this your intention?

[ricvigi]

I am still trying to figure out how pull requests work... At the beginning of the course i forked the repo and i kept pulling from the origin and pushing to my forked repository. When i fixed some of the issues for me and issued the pull request, it was not very clear to me whether it was possible for you to only integrate the notebooks, instead of the whole fork (which also contains some personal notebooks about some topics we covered in class). Please let me know if this is possible, otherwise i'll try to figure out how to do it properly!