rehype-mathjax: use `abstractAdopter` instead of `jsdomAdaptor` / `browserAdaptor`

[wooorm]

Problem

JsDom is heavy, and an alternative to rehype, which we’re already using. It’s probably better to use AbstractAdopter and map it to hast, instead of using jsdomAdaptor / browserAdaptor to create a DOM and then transform that to hast.

Expected behaviour

Directly do mathjax -> hast, instead of mathjax -> dom -> hast

[tani]

lightAaptor is also adaptor for lightDOM. Thus, mathjax -> dom -> hast is not changed.
If you want to do that, we should implement AbstractDOMAdopter abstract class to hast instead.
https://github.com/mathjax/MathJax-src/blob/5e9a5c66de610dd754a0377b278892ae4f007058/ts/core/DOMAdaptor.ts#L343

[wooorm]

Oh great, that looks better! I couldn’t find any docs on these things 🤔 is there some place where you find these things, or is it reading the code too?

[tani]

I've just read the code. Currently, the developers guide of MathJax is under construction. https://docs.mathjax.org/en/latest/api/direct.html

[wooorm]

Was looking at this some more today, I won’t have a lot of time to work on it, but I think it would be a very valuable feature. @tani, is this something you could take on? Or someone else?

[wooorm]

@tani was that 🚀 a yes? ;)

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