As a Wikisource user, I want MathML support on Wikisource, so that I can view mathematical formulas in a readable format.
**Background**: "Currently on the different wiki, it is possible to activate MathML to have a nice render of mathematical formulas instead of vector images. The current export process does not allow to have this MathML format and include all mathematical formulas as images, like the old mediawiki way. MathML being now vastly handled, it would be really useful to be able to export the code with MathML." - Wikisource user
**Acceptance Criteria:**
* Investigate if pros/cons of enabling mathml on wikisource
* Investigate how formulas can always be text rather than images (example: https://fr.wikisource.org/wiki/Page:M%C3%A9moires_de_l%E2%80%99Acad%C3%A9mie_des_sciences,_Tome_6.djvu/580)