Conflicts:
- `.env.production.sample`:
Upstream added a block of three environment variables, while glitch-soc
has a different version of the file overall.
Added upstream's changes.
- `app/helpers/application_helper.rb`:
Upstream added a helper, while glitch-soc had extra helpers.
Added upstream's helper.
Conflicts:
- `app/lib/content_security_policy.rb`:
Conflict caused by glitch-soc's support for the extra `EXTRA_DATA_HOSTS`
environment variable.
Ported upstream's changes while keeping support for `EXTRA_DATA_HOSTS`.