As an aside, in 2021 Computer Modern looks really dated, especially for content that’s predominantly text rather than math. There are much better, more Unicode-friendly, and more typographically complete LaTeX fonts available.

Which fonts would you recommend?

Recently I've been using `mathpazo` which is Palatino extended with matching math symbols (if math is needed; if not, just use plain `palatino`).

Specifically, I use `mathpazo` with smallcaps and old-style figures enabled:

  \usepackage[sc,osf]{mathpazo}

(And yes, I realize that the original Palatino actually predates Computer Modern :D)

> I could render the markdown with the Computer Modern font

You really shouldn't though. Computer Modern is a pretty ugly font.

At least use something like New Computer Modern if you really need a Scoth Roman font with maths.