Remove fonts folder and start to use Google Webfonts

Remove Lato-Regular, Lato-Bold, Museo and Lato-Italic.

Now we will only use Lato with font-style: italic or font-weight: bold.
(the right way).
Also, museo was dropped in favor of Arvo GWebfont.

Faster loadtimes and a reliable cache; the ability to change the font
has now become an easy thing.
Start to use Google webfonts.