LaTeX equation rendering in HTML documentation

[lorenzschmid]

Adapts the HTML documentation generation:

• Replace any strings inside the description/comment fields wrapped by dollar signs ($ and $) indicating a LaTeX equation with inline delimiters (\( and \)) such that the equations can be detected by MathJax.
• Adds new argument --doc-include-js-dep to allow insertion of external JavaScript dependencies:

  ...
  </STYLE>
  <script type="text/javascript" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js"></script>
  </HEAD>
  ...

Renders inline equations such as $f_s = \frac{30.72}{2} \text{MHz}$ as Matlab equations $f_s = \frac{30.72}{2} \text{MHz}$.

[tgingold-cern]

Thanks!