rename module path from impact-80 to qmk-rgb
The module was declared netdome.biz/paul/impact-80 while the repository,
the directory and the binary have all been called qmk-rgb since fb0d207.
That commit ("Rename CLI from wobkey to qmk-rgb") replaced the original
github.com/wobkey/rgb with a self-hosted domain but paired it with the old
project name, and nothing has corrected it since.
The path was never resolvable anyway: netdome.biz serves no go-import meta
tag, and the gogs host 404s for the anonymous ?go-get=1 lookup. The main
module is never fetched — go reads it from disk with Main=true, and a build
under GOPROXY=off succeeds without contacting git or the proxy. So this is a
naming fix, not a functional one, confirmed by a control build under a
deliberately fictitious module path.
Mechanically: the go.mod directive plus 30 import lines across 19 files. No
documentation referenced the old name, so nothing needed syncing there.