Use the new puppet-weblate module

Use the new module: https://gitlab.tails.boum.org/tails/puppet-weblate

Keep the staging website and reverse proxy configurations around because it depends on our current legacy config.

refs sysadmin#16958

Deployment

When deploying this change, hiera data needs to be updated accordingly:

Old name	New name
tails::weblate::postgres_password	weblate::postgres_password
tails::weblate::weblate_admin_password	weblate::weblate_admin_password
tails::weblate::weblate_secret_key	weblate::weblate_secret_key
tails::weblate::redis_password	weblate::redis_password