Make a nicer frontend template

[alexlenail]

See e.g.

• https://www.tweag.io/blog/2020-10-28-mcmc-intro-4/
• https://rpsychologist.com/likelihood/
• https://peterroelants.github.io/posts/gaussian-process-tutorial/
• LinuxLibertine font
• Wikipedia (e.g. https://en.wikipedia.org/wiki/Lorenz_96_model) uses pygments (https://pygments.org/demo/#try)
• Base16: https://github.com/chriskempson/base16-html-previews/tree/master/css
• https://github.com/MagicStack/MagicPython/tree/b2b4f4ae7b4e6284e80bda8080106b93bd588f9e
• Light themes: https://vscodethemes.com/light
• Jekyll Tufte Theme as seen in Stefano Ermon's course notes

[alexlenail]

Things I concretely want to change:

• [x] a better font for the text
• [x] syntax highlighting
• [x] auto-fold some code blocks
• [x] tables smaller margins

[alexlenail]

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