meta.sr.ht: overhaul init files

meta.sr.ht: use app, not app_dispatch, w/gunicorn

The latter has been removed now that instrumentation is built into
core.sr.ht.

Fix supervisor in meta.sr.ht init scripts

meta.sr.ht: normalize init scripts

Make local redis service optional

Add extra gunicorn args to *.init

Fix more indentation issues

Update meta.sr.ht for prometheus support

Add logs to init files

Rename meta.sr.ht init script

Package meta.sr.ht