📚 Install manpages automatically

[pschmitt]

Following #12 it now makes sense to have zinit automatically detect manages in plugins and symlink them to ZPX/man/man[1-9].

This leads the creation of a new ice nomanpages to explicitly disable that behavior (analogue to nocompletions)

TODOs:

• zinit detects manpages if there is a myplugin.1 file in the root of the repo
• Alternative paths get searched as well such as man/myplugin.1 or doc/man1/myplugin.1
• no manpage gets symlinked if nomanpage is used

[ryaminal]

i was thinking about starting work on this. wondering if there are thoughts if this belongs in zinit or as an annex? i'm leaning towards an annex but thought i'd ask.

[pschmitt]

I'd rather implement this in zinit rather than an annex. Zinit already creates the mandir and requiring an annex to simply do a cp *.1 $ZINIT[MAN_DIR] seems a bit overkill to me.

[alichtman]

Agreed: manpage management should probably belong in zinit itself.