fix(avatar.jade): change .notBackground to .noBackgroundImage

avatar.jade was applying a class of .notBackground, but the css in
avatar.styl used .noBackgroundImage.

* Changed .notBackground to .noBackgroundImage in avatar.jade and
avatar.styl
* Consolidated css and added more comments
* Amended spacing as Stylus wasn’t compiling correctly
* Removed #profileStable and .pet css as couldn’t find reference to
them anywhere else.
* Commented out styles indicating who is party leader for now. Need a
solution that doesn’t involve background color.