Piccolo Now Sports LaTeX Support

In the first of two enhancements to piccolo, LaTeX support has been added. Just put the LaTeX in a latex-pic element and it will be converted to a PNG, with the alt text set to the LaTeX code.

<latex-pic>E = mc^2</latex-pic>

Transforms into:

E = mc^2

This is mostly driven by me trying to learn Geometric Algebra and wanting to talk about things like:

e_{23} = e_2 \wedge e_3

Next up is adding inline Julia.