[PRQ#47745] Deletion Request for arcadia

MarsSeed [1] filed a deletion request for arcadia [2]: Abandoned, broken Ruby package from 2015. Does not declare its core GUI dependency. But it has also been discontinued since 2015, so it's better to delete this PKGBUILD. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/arcadia/