Merge commit '1e3b19230a48174acf524cf1a9f5a498e220ea7d' into glitch-soc/merge-upstream

Conflicts:
- `app/models/account.rb`:
  Upstream added new validations close to lines on which glitch-soc had
  modified validations to handle custom limits set through environment
  variables.
  Ported upstream changes.
- `config/initializers/content_security_policy.rb`:
  Upstream added `AZURE_ALIAS_HOST`. Glitch-soc's version of the file is
  completely different.
  Added `AZURE_ALIAS_HOST` to our version of the file.

Gemfile

@@ -18,6 +18,7 @@ gem 'aws-sdk-s3', '~> 1.123', require: false
 gem 'fog-core', '<= 2.4.0'
 gem 'fog-openstack', '~> 0.3', require: false
 gem 'kt-paperclip', '~> 7.2'
+gem 'md-paperclip-azure', '~> 2.2', require: false
 gem 'blurhash', '~> 0.1'
 
 gem 'active_model_serializers', '~> 0.10'