Complete layout overhaul. CSS where streamlined and now there is only one besides Gumby own CSS. Template files were reworked to compose the new MexApi theme and there are lots of changes (too many to describe here, look at the diffs). Makefile and Pelican config files were also changed to fit the theme needs and cleanup. Rearranged some files under content/, deleted many unused code and files under themes/ and utils/. Gum theme patch is gone as there is no sense to keep it anymore. Other patches required where moved to a better place. Also, I'll keep track of the plugins I use myself. I'm sure I can call this one 'MexApi 3', although there are some content adjustment yet to come.