Use revealjs's math plugin for mathjax.

This is a thin wrapper around mathjax that makes math look better
on revealjs.

See https://github.com/hakimel/reveal.js/#mathjax

We do this by setting the 'mathjax' boolean variable and
using it in the revealjs template. Also, for revealjs
and mathjax, we don't assign the usual thing to the 'math'
variable, since it's handled by mathjax config.

Closes #3743.

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