feat(#622): integrate math with Katex

[peterpeterparker]

Current status:

I'm not able to render the following default example, probably some encoding issue or whatsoever. A blocker issue to go forward.

% \f is defined as f(#1) using the macro
\f{x} = \int_{-\infty}^\infty
    \hat \f\xi\,e^{2 \pi i \xi x}
    \,d\xi