Conflicts:
- `Gemfile.lock`:
Not a real conflict, just a glitch-soc-only dependency too close to a
dependency that got updated upstream. Updated as well.
- `app/models/status.rb`:
Not a real conflict, just a change too close to glitch-soc-changed code
for optionally showing boosts in public timelines.
Applied upstream changes.
- `app/views/layouts/application.html.haml`:
Upstream a new, static CSS file, conflict due to glitch-soc's theming
system, include the file regardless of the theme.
- `config/initializers/content_security_policy.rb`:
Upstream dropped 'unsafe-inline' from the 'style-src' directive, but
both files are very different. Removed 'unsafe-inline' as well.
