Render Mathjax/Katex

[TheRealLorenz]

Hi!

Stumbled upon this project and I really like it, but I came across a small issue while trying to write maths in md.

I've checked the code and it seems that the arithmetix extension of python markdown is being loaded, but the mathjax/katex cdn should be included in the client code and MathJax.typeset() should be called in the update function.

[TheRealLorenz]

Reference:

• Arithmatix render: https://facelessuser.github.io/pymdown-extensions/extensions/arithmatex/
• Dynamic Content: https://docs.mathjax.org/en/latest/advanced/typeset.html