feat: add tufte css theme

[DamonsJ]

add tufte css theme
add sidenote and marginfigure

see alse :

https://github.com/edwardtufte/tufte-css

https://github.com/clayh53/tufte-jekyll

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[george-gca]

Nice work porting the Jekyll solution. But I'll need more time to review this.

I think we should first understand why tufte-jekyll implemented a lot of stuff as plugins. Then we should check if we should do the same, or if there is a more elegant solution. Also idk if just importing the css file wouldn't clash with our current csses. Maybe it interferes with the current built-in posts or projects, then we should be more careful. Maybe we should create something like the solution we use for importing other libraries, like when doing plots, that we add some flag to the post front matter and that enables the importing of the css.

I'll take a deeper look at it, but it will take some time, since I have been busy with other stuff at hand.

[DamonsJ]

If there is a better solution, that would be great.
take your time, but please consider the sidenote stuff!

[george-gca]

I agree that the side note is really useful, and it would be a great addition. I am just afraid that simply importing the css might override some classes and mess with the styling of the site somewhere.