Support for Code Folding on Markdown Headings

[dev-nicolaos]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

I have a large chunk of content on the page that I want to temporarily ignore so that I can more easily focus on other content. This content all rolls up under one markdown heading (specified by #).

Solution

This plugin could (maybe, idk on a technical level, but trying to answer the prompt) implement VSCode's code folding feature to allow me to temporarily hide the content. This is currently possible in raw markdown files, and inside JSX blocks in MDX files.

Alternatives

Not sure if the move in MDX2 to be more JSX and less HTML based makes this harder to implement. I'm open to alternative solutions, but code folding seems to be the standard way this problem is solved typically.