Fix LaTeX in Docs

The latex content in the source files (markdown) seems to get correctly parsed into html elements with class math:

<p>The probabilities are factored in the following way:</p>
<div class="math">
<p><span class="math">P(\\vec{\\rho}, \\vec{t}, \\vec{\phi}, \\vec{O} | \\vec{D_H}, s)...</span></p>

added 1 commit

44f39a17 - add math on first page to ensure mathjax is loaded by sphinx automatically

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Noticed that mathjax javascript seems to be missing from docs pages (not in header). For comparison, another sphinx-built site that has properly rendering latex has the following script header

<script defer="defer" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>

Found a bug report that indicates our version of sphinx may only check rst files for a math directive, then decide about including mathjax or not, and finally let other renderers play (like myst_parser, which we use for all pages in other projects but use a mix in gstlal of markdown and rst).

Testing this now by including a minimal math directive on the homepage.

Notes for posterity:

Docs stage still has many instances in which python module imports fail (environment issues / dependencies not met). Doesn't cause docs build to fail, but will cause automodule docs to be absent for the modules in question, mostly impacts docstrings.