Math markup support

$\sqrt{2}$
or
$$\sqrt{2}$$
or maybe
math f(x) = \int_{\infty}^\infty\hat f(\xi),e^{2 \pi i \xi x},d\xi
should render using MathJax.
(If it's a choice, I would prefer the dollar sign markup, since it's used on other sites.)
I don't know anything about nodeBB, but maybe these are what it needs?
https://github.com/benabel/nodebbpluginkatex
https://www.npmjs.com/package/nodebbpluginmath
https://community.nodebb.org/topic/8278/mathjaxsupport/15?_=1613103140024&lang=enUS

@Psephomancy Yeah, maybe I should try installing those plugins. I guess they won't break it.