Old README was upstream QMK boilerplate (badges, generic feature list,
QMK maintainer credits) that no longer matched this repo's purpose.
Replaced with an overview of this fork's actual keymaps (Keychron Q5
Max, K17 Max) plus a note that git.rootiest.dev is the primary repo
and github.com is a one-way mirror (direct GitHub pushes get
overwritten) that also hosts the prebuilt firmware releases.