Document what Calva functionality requires cider-nrepl

[bpringe]

From @seancorfield in Slack:

It would be great if Calva could specifically document what functionality requires CIDER and what doesn't so folks could understand the trade offs.

Starting a list here (@PEZ please chime in with other functionality - I'm just adding a couple based on what I know without diving into the code at this point).

• Go to definition (unless you configure Calva to use clojure-lsp for this over the repl)
• Debugger