* Serialize broadcast_data within AsyncInfoController::base_data
Adds a `broadcast:` key to our `base_data`, regardless of whether a user is logged in or not.
If a broadcast is not present, passes along a `nil` value.
* Initialize active broadcast (if present) when rendering main page
* Allow admins to preview a broadcast's processed_html when editing
* Add some fixed position styling to active broadcast
* Add system specs around broadcasts on homepage
* Use sanitize in place of html_safe when previewing broadcast
* Do not initialize broadcast if no broadcastData available
* Render default value on broadcast in options_for_select
* JS cleanup
* Unset fixed positioning for static navbar config
Also add some default styling for an active broadcast
* Initial work for streaming app shell way of using serviceworkers
* Close in on serviceworker adjustment finalization
* Add docs and loading indicator
* Remove useless code
* Don't run on API
* Update app/javascript/contentDisplayPolicy/hideBlockedContent.js
* Fix small details
* Don't run serviceworker.js code in test env
* Fix JS in serviceworker
* Move private keyword to proper place in async controller
* Change shell_version to HEROKU_SLUG_COMMIT
* Update caching config
* Add test for async_info/shell_version
* Initial automatic cleanup with rubocop
* Fix syntax error introduced by rubocop
* Cleanup seeds file
* Cleanup lib folder
* Exclude bin folder because it contains auto generated files
* Make Rubocop a little bit more chatty
* Block length should not include comments in the count
* Cleanup config folder
* Cleanup specs
* Updated Rubocop version and generated a todo file
* Fix broken ArticlesApi spec
* Fix tests
* Restored rubocop pre-commit hook
