Follow a user

[DontMash]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
As a user I may want to follow another user because of his unique/special content.

Describe the solution you'd like A clear and concise description of what you want to happen.
When visiting a users profile I'd like to be able to click a button to follow/unfollow a user. Following a user will provide me with notifications for new content posted by said user.
Requires notification-system and -overview.

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.
-/-

Additional context Add any other context or screenshots about the feature request here.
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