Add User Info card on hovering a users avatar

[Mastercuber]

@appinteractive what information should be displayed in the card?

[appinteractive]

Related with #238

[appinteractive]

@Mastercuber basically some more information and actions that relate to the user:

• image (maybe also header image as background)

• Follow Button

• Block Butten

• Go to Profile

• Maybe a short description by the person (new feature)