man.sr.ht: add py3-scmsrht dependency

man.sr.ht/post-upgrade: run core.sr.ht migrations

man.sr.ht: normalize init scripts

Add py3-yaml to man.sr.ht dependencies

Make local redis service optional

Add extra gunicorn args to *.init

Add -openrc to man.sr.ht

Fix more indentation issues

Fix typo in man.sr.ht package

Update man.sr.ht.post-upgrade

Also moves alembic dependency to py3-srht

Update man.sr.ht.init

Add man.sr.ht package