Big re-factor & re-format of entire website

I know this wasn't really necessary, and you don't know me, but I like nice-looking code and consistent websites :smiley: 

- 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

If you ever need any other work done, I'd be happy to oblige. :+1: 

Example of changed page: [image link](http://iaero.me/i/oa58F)