Remove unused font files + same location of Roboto for dev and prod

• added compressed bundle for all used FontAwesome CSS's dist/fonts/fa/css/fa-all4ub.min.css and use it to generate index page
• removed deprecated woff, svg, ttf & eof fonts for FontAwesome. Remained woff2 is enough - all modern browsers uses woff2
• Roboto* font files is placed into /dist/fonts for both dev and production builds