Port 5129f6f2aa to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

Merge upstream changes

Added and documented MAX_SEARCH_RESULTS to the .env.production.sample file

Changed the default search limit to allow a variable called MAX_SEARCH_RESULTS in the .env.production file to change the maximum search results limit.

* Add spec covering numeric-only hashtags

* Fix hashtag regex

Port SCSS changes from 730c4053d6

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

Port SCSS changes from b851456139 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

Conflicts:
- Gemfile.lock
- app/controllers/accounts_controller.rb
- app/controllers/admin/dashboard_controller.rb
- app/controllers/follower_accounts_controller.rb
- app/controllers/following_accounts_controller.rb
- app/controllers/remote_follow_controller.rb
- app/controllers/stream_entries_controller.rb
- app/controllers/tags_controller.rb
- app/javascript/packs/public.js
- app/lib/sanitize_config.rb
- app/models/account.rb
- app/models/form/admin_settings.rb
- app/models/media_attachment.rb
- app/models/stream_entry.rb
- app/models/user.rb
- app/serializers/initial_state_serializer.rb
- app/services/batched_remove_status_service.rb
- app/services/post_status_service.rb
- app/services/process_mentions_service.rb
- app/services/reblog_service.rb
- app/services/remove_status_service.rb
- app/views/admin/settings/edit.html.haml
- config/locales/simple_form.pl.yml
- config/settings.yml
- docker-compose.yml

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.4.0 to 0.4.1.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.4.0...v0.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fix #10840

* Added logout to dropdown menu

* Triggering build-and-test with empty commit as it seems it failed due to some internal failure

* Looks fine, ready to review

* Added changes from review

* method can be null without any problems

* Also target can be null

* Add test

* Fix code for sanitizing nested lists stripping all tags

* Add support for an instance actor

* Skip username validation for local Application accounts

* Add migration script to create instance actor

* Make Codeclimate happy

* Switch to id -99 for instance actor

* Remove unused `icon` and `image` attributes from instance actor

* Use if/elsif/else instead of return + ternary operator

* Add instance actor to fresh installs

* Use instance actor as instance representative

Use instance actor for forwarding reports, relay operations, and spam
auto-reporting.

* Seed database in test environment

* Fix single-user mode

* Fix tests

* Fix specs to accomodate for an extra `Account`

* Auto-reject follows on instance actor

Following an instance actor might make sense, but we are not handling that
right now, so auto-reject.

* Fix webfinger lookup and serialization for instance actor

* Rename instance actor

* Make it clear in the HTML view that the instance actor should not be blocked

* Raise cache time for instance actor as there's no dynamic content

* Re-use /about/more with a flash message for instance actor profile

Port d723f2a0a8 to glitch-soc

Port ef11347281 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

Fixes #1136

Fix #10934

Fix #11186

Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/kickstarter/rack-attack/releases)
- [Changelog](https://github.com/kickstarter/rack-attack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kickstarter/rack-attack/compare/v6.0.0...v6.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/rubocop-hq/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rails/compare/v2.2.0...v2.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [puma](https://github.com/puma/puma) from 3.12.1 to 4.0.1.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.12.1...v4.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Add environment variable to disable the anti-spam

* Move antispam setting to admin settings

* Fix typo

* antispam → spam_check

Fix #11328

Cherry-pick changes from upstream

* Extend AUTHORIZED_FETCH mode to user blocks as well

* Move decision to deny access to StatusPolicy

* Fix reverse-proxy caching in public fetch mode

* Fix caching in ActivityPub-specific controllers