lists.sr.ht: upgrade to 0.48.19

*.sr.ht: move nginx files

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

lists.sr.ht: add -nginx subpackage

lists.sr.ht: overhaul init files

Add default non-conflicting ports

Based off of config.ini debug-port values

Fix various user creation bugs and inconsistencies

- ensure that all users are added to their corresponding groups
- replace listssrht user with lists
- ensure that the git user creates its homedir
- ensure that adduser args are in same order across all apks

lists.sr.ht: fix -lmtp openrc service

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

lists.sr.ht: Use srht-migrate for core migrations

Make local redis service optional

Add extra gunicorn args to *.init

Add --loglevel=info to lists.sr.ht-process

Fix indent on lists.sr.ht openrc files

Fix broken OpenRC files in lists.sr.ht APKBUILD

Add additional openrc services for lists.sr.ht