Big re-factor & re-format of entire website

- neatened up HTML code (come on guys, you're working with markup languages already!)
- changed the navbar, about page and downloads page a bit (to look nicer and be more functional)
- actually implemented Roboto font you guys had commented out
- put stuff into containers to make everything look nice(r)
- removed bootstrap from website project and referenced external copies (from a cdn, dw)
- swapped out random tabs for spaces for consistency