Inline mathjax support

[Dafeigy]

Hi, I really like this theme, and I currently is using it for sci research recording! I noticed that previous issus#2 has support block mathjax equation, however when using this theme with [email protected], inline mathjax is not rendered:

I create a PR that can easily solved this issue, though homepage loading time becomes a little bit longer. Maybe a if-statement in mathjax render logic can be added? I don't know much about stylus and ejs, but I think this will work.

Thanks again for your beautiful work~