hub.sr.ht: add post-upgrade

*.sr.ht: Enable prometheus multiprocessing mode

hub.sr.ht: upgrade to 0.13.5

hub.sr.ht: upgrade to 0.13.1

*.sr.ht: move nginx files

hub.sr.ht-nginx: add sr.ht-nginx dependency

hub.sr.ht: add -nginx subpackage

hub.sr.ht: overhaul init files

hub.sr.ht: new aport