Add modern markdown tags

[Jako]

Summary

It would be great if modern markdown tags like admonitions can be added to the parser.

https://squidfunk.github.io/mkdocs-material/reference/admonitions/

[Mark-H]

I'm not immediately seeing admonitions for CommonMark but I've enabled a bunch of extra extensions in #355

This explains a possible extension tho we could look at: https://www.dasun.dev/blog/implementing-markdown-alerts-with-commonmark