* Move from env variables to SiteConfig
Related to #5384
This PR only deals with the first remaining part outlined in the issue, starting to use existing SiteConfig keys instead of the env variables.
* Restore Envfile to original version for now
* Increase efficiency and fix pagination offset issue
Right now we filter recently aggregated notifications at runtime, which worked before when there was no pagination, but now filtering is not a good idea combined with offset pagination because it throws off the calculations.
The filtering should be done in the SQL query before paginating, which is what we've switched to. I added a bunch of scopes to make the code clearer as well.
To avoid nesting tags I've also updated the HTML and the JS logic to insert it in the right place.
* Add explanation for hiding the load more button for new users
* Use offset instead of page and explain things
* Make load more button work
* Add tests for admin view
* Restore the previous logged out behavior
* Modernize initNotifications.js
* Revert "Modernize initNotifications.js"
This reverts commit 4a112b797d7911c4ab63ad0c0a07111b4e7abe25.
* Fix elements presence errors
* Change load-more-button to only appear if 7 or more posts (and some notification copy adjustments)
* Remove notifications synchronously on unpublish and destroy
* Asynchronously remove reaction notifications for article
* Remove all associated notifications when destroyed
* Fix edge case for reaction notifications
* Load new comment_box file instead of old one
* Delete legacy views
* Remove unused private declaration
* Use casecmp.zero? instead of downcase for speed, and use @user
* Add friendly error message for notifications
* Use delete all and not destroy b/c no callbacks
