Refactor profile page

A refactor of the profile page is necessary now that user documents were introduced. It would be helpful if both documents that were liked by the user (in the case of a users own profile) and documents that the user owns were shown on a users page. I currently think that introducing different tabs on the page would be the best option, but i'd also be happy with a different UX.

@lmoeller         /-------\ /---------\
Lukas Möller      | 514   | | 12      |
                  | Score | | Answers |
                  \-------/ \---------/


 Overview   Documents   Answers   Settings
-----------===========------------------------------

You Documents
/-------------\ /-------------\
| DnA Summary | | WuS Summary |
| 13 <3       | | 53 <3       |
\-------------/ \-------------/


Documents you liked
/-------------\ /-------------\ /-------------\ 
| DnA Summary | | WuS Summary | | WuS Summary |
| 13 <3       | | 53 <3       | | 53 <3       |
\-------------/ \-------------/ \-------------/