Hello Lunny,
thank you for to detailed post.
Do you know how to customize Gitea further, such that the mathematical equations are also drawn by MathJax which are created automatically by Jupyter?
This was already discussed here (Katex/MathJax render) but the focus lies on Pandoc and Katex. Therefore that discussion is only a bit helpful for the Jupyter/MathJax case.
Anyhow if you know how to do it, do you mind updating your blog post. It might be helpful for a lot of people (including me).
Best Regards
Gilles