Switch to Open Sans and a larger base font size, drop #global size factor
Readjust intro section measurements for the new font metrics
Line height 1.6em -> 1.7em
Use Montaga for headings, and readjust the text color lightness scale

Also drop the awful fallbacks that aren't Times New Roman.
Add some alternatives for the Download button's font
Merge branch 'staging/font-set-overhaul'