lists.sr.ht: remove unidiff dependency

Add py3-emailthreads to lists.sr.ht dependencies

Add py3-pygit2 to lists.sr.ht deps

lists.sr.ht: normalize init scripts

lists.sr.ht: add lists.sr.ht-webhooks

Fix broken OpenRC files in lists.sr.ht APKBUILD

Add additional openrc services for lists.sr.ht

Add lists.sr.ht & its dependencies