Support MathJax

[Thomas Nield]

It would be helpful if there was support for MathJax.

This would be enormously helpful for data science library documentation, and expressing mathematical equations over pieces of code. I know @kyonifer did a hack in Koma using MkDocs but it is not streamlined, and relies on pip and Python builds.

[Paweł Marks]

MathJax support is an example plugin that is distributed with dokka.