Homepage redesign

I think that such a great library needs a better looking website, so I started working on one. Take a look at the index.html file and let me know if you like it; if you do then I'd be happy to work it into something that can work site-wide.

It's still pretty rough, there are a lot of details I still need to hammer out (mostly responsive stuff). I just want to make sure you'd be interested in something like this before I invest a lot of time into it.

This PR shouldn't be merged, obviously, because the homepage is the only one that currently works. :wink:

Thanks for all the work you do!