Cleanup old superseded workflow, script and key material

.gitattributes

.gitlab-ci.yml

.gitlab/check-keyids-change

archlinux-revoked

archlinux-trusted

archlinux.gpg

master-keyids

master-revoked-keyids

master-revoked/dan.asc

master-revoked/ibiru.asc

master-revoked/thomas.asc

master/allan.asc

master/anthraxx.asc

master/bpiotrowski.asc

master/dvzrv.asc

master/florian.asc

master/pierre.asc

packager-keyids

packager-revoked-keyids

packager-revoked/aginiewicz.asc