Update to the flairs as described in issue #7.

Maps: Add flair and sidebar filter (Flair tbd)
News: Add flair and sidebar filter. (Suggested flair: Sign)
Tutorials: Change flair to a normal book
Art: Rename to Fanart
Creative: Rename to Builds (Flair tbd)
Survival: Rename to Gameplay (Flair tbd)
Help: Remove sidebar filter
LPs: Remove sidebar filter