* After creating the post, the author of it automatically observes it to get notifications when there are interactions
* a user that comments a post, automatically observes that post to get notifications when there are more interactions on that post
* mutation that switches the state of the obeservation of a post on and off
* remove duplicate code
* fix unit tests
* add metric observed users count to posts
* change naming
* Add follow post entry to post menu
* Add FollowButton (WIP), show unfollow in menu when already followed
* Follow/unfollow post => observe
* Update slashed bell
* Add requests to observe/unobserve posts
* Add ObserveButton functionality
* Rename isObservedByMe
* Add observingUsersCount; simplify ObserveButton and menu entries
* Fix locales
* Add snapshot test for ObserveButton (WIP)
* Remove empty routes push
* Add test for ObserveButton
* Add test for ContentMenu, improve ObserveButton test
* Remove unneeded fields from PostQuery
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Co-authored-by: Moriz Wahl <moriz.wahl@gmx.de>
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