Clean up nav panel

This has been talked about a few times already, now is the time to finally do something about it as chats and bookmarks are right behind the corner adding 2 more items to nav panel for all users.

My proposal is to leave nav panel there for a few select options that should not be hidden behind extra clicks, and take away all timeline-likes from it replaced with just "Timeline". in addition every timeline-like has back-and-forth navigation between each other via a dropdown in the panel header. A picture says more than a crappy description, just imagine bookmarks and lists also in the dropdown list:

(the friends timeline -> your feed is just a suggestion, could be called just Home or something, anything is fine I don't have an opionion)