- :before ci will try to load $REPOROOT/ci.el or $DOOMDIR/ci.el. It
finds $REPOROOT by calling `git`, but doesn't handle errors. Now it
does.
- Because &rest was in :before ci's argspec, :before ci * subcommands
would be inaccessible (not that any exist atm, though).
- Let the user know when it finds the project's ci.el.