Feature Request: Support for rendering math, like LaTeX or KaTeX

Hi,

I really like Quire for the time I've been using it. It has since been improving my productivity!

However, sometimes I encounter use-cases where I need to specify variablesnames or math formulas/functions. Implementing a feature for rendering math with a LaTeX-like syntax would be a great extension to the current markdown support of Quire, in my opinion.

Also KaTeX is a good example. To my understanding it is a lighter/faster cross-borwser alternative for rendering a simpler LaTeX language.