Math support for Wiki-pages

[fuhto]

Recently GitHub was introducing math support in markdown. It would be great if math expression would also be rendered on Wiki pages. It would help our team a lot to document our code.

[isinicolle]

De acuedo contigo

[nschloe]

Duplicate of #17157.

[davidstaheli]

This is now supported in wikis: Wikis now support math and Mermaid diagrams. But please also check out @nschloe's excellent https://github.com/nschloe/xhub extension!