md: enable custom anchor id/href for troubleshooting guide?

[jorgeorpinel]

https://dvc.org/doc/user-guide/troubleshooting will have hardcoded H2 elements so we can choose the id to be short enough for error.dvc.org/{title} redirects (turned into URL hashes into this one page).

It would be ideal if we could use markdown instead (react-markdown renders them with a nice anchor link), but we don't control the id and href values in there, which tend to a little long.

Implement a solution to this in our JS engine? Find a better workaround than hardcoded H2s?

[jorgeorpinel]

Would this imply using a special markdown syntax like

## [Too many open files error](#many-files)

(and preventing the linking default)? If so, this seems probably too much to me. "Hardcoded" H2 elements is actually technically valid Markdown anyway. We just miss the nice anchor links – which could be hardcoded in as HTML/SVG as well, BTW.

[shcheklein]

[Too many open files error](#many-files) this one already has certain meaning, so not sure this is the best idea. In general yes, it should something simple and similar to this and implementation to our expandable sections I imagine.

[jorgeorpinel]

[Too many open files error](#many-files) this one already has certain meaning

When you put it in a header ## actually it throws a react render error so I guess it's available.

Another idea, just:

## Probably long title #short-hash