widgets/prelude: incorporate the new vector_graphics fonts
widgets/prelude: incorporate the new vector_graphics fonts

* introduce woff2 fonts
* keep ttf font as 'material_icons_font_ttf'

Signed-off-by: Ralf Zerres <a55c5beace021459791f5070a9a90148cd697b8f@networkx.de>

redox-os/orbtk