3c8a4b585f
Every other distro has a full Host Setup page; Arch only had table rows. Add docs/arch.md (signed pacman binary repo: key import + repo + install, GPU prereqs, service/linger, web console, client, PKGBUILD appendix), slot it into the nav after fedora-kde, and point the install/client tables at it. Update the client-install rows from 'from the PKGBUILD' to the binary repo now that it exists. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>