Merge branch 'master' into master

.env.production.sample

Gemfile

Gemfile.lock

ISSUE_TEMPLATE.md

...features/notifications/components/clear_column_button.jsx

app/assets/stylesheets/about.scss

app/assets/stylesheets/accounts.scss

app/controllers/about_controller.rb

app/controllers/admin/settings_controller.rb

app/controllers/auth/registrations_controller.rb

app/controllers/remote_follow_controller.rb

app/lib/email_validator.rb

app/lib/feed_manager.rb

app/lib/inline_rabl_scope.rb

app/models/block.rb

app/models/follow.rb

app/models/follow_request.rb

app/models/mention.rb

app/services/fan_out_on_write_service.rb

app/services/notify_service.rb