cider-doc: understand http links

[vemv]

It would be nice if links were parsed, nicely rendered and clickable, honoring commonly-used formats.

Sample specimen:

[bbatsov]

Why is this something that should be done on cider-nrepl's side? I'm guessing it has to do more with what the clients are doing with the markdown they receive.

[vemv]

I haven't dived into it but it depends - docstrings are expressed in disparate formats, so a best-effort parser would seem simplest to implement cider-nrepl side.