Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- README.md
- app/helpers/statuses_helper.rb
  Upstream moved account helpers to their own file, we had extra
  helpers there, moved too.
- app/lib/sanitize_config.rb
- app/models/user.rb
- app/serializers/initial_state_serializer.rb
- config/locales/simple_form.en.yml
- spec/lib/sanitize_config_spec.rb

Gemfile

@@ -137,7 +137,7 @@ group :development do
   gem 'letter_opener', '~> 1.7'
   gem 'letter_opener_web', '~> 1.3'
   gem 'memory_profiler'
-  gem 'rubocop', '~> 0.74', require: false
+  gem 'rubocop', '~> 0.75', require: false
   gem 'rubocop-rails', '~> 2.3', require: false
   gem 'brakeman', '~> 4.6', require: false
   gem 'bundler-audit', '~> 0.6', require: false