Add social features [1st part]

[SamR1]

related to: #125, #296, #298, #299, #381, #382

🚧 WIP, some features may change 🚧

• add visibility levels to workouts (=privacy levels)

  • 3 levels: private, followers_only, public
  • distinct visibility levels between workout data (title, date, distance...) and geolocation-related data (map, analysis) (note: workout notes are only visible to the workout owner)
  • by default, all data are private (default visiblities can be changed in user preferences)

• timeline on dashboard displaying the workouts a user can see

• a user can (un-)follow another user

  • by default, a follow request must be manually approved (default value can be changed in user preferences)
  • users directory
    • preference to hide user account. By default, user is hidden.

• a user can comment a workout

  • 3 levels: private (only mentioned users can view comments), followers_only, public
  • a user can edit or delete his comment
  • mention suggestions autocomplete

• a user can (un-)like a workout or a comment

• notifications on UI

  • on follow request, new comment on a workout, new reply on a comment, like on a workout or a comment
  • mark all notifications as read
  • new user for admins

• improve users preferences display

• markdown support in Comments and Notes
  Note: marked needs Node 18+

• a user can (un-)block another user

  • display blocked users list in user profile

• [in progress 🔄]: moderation tools (see Moderation tools #382)

• TODO: check equipments feature

  • Notes: equipment is only visible to its owner

• TODO: update dark mode

• TODO: update user export

• TODO: default privacy policy update

• TODO: update documentation