Website redesign

Hey everybody,
I finally found some time to redesign the AsciiMath website! =)
I tried to stick to a very clean and open github like design style. I also added most of the syntax and included some special cases I wish I had known when starting out with AsciiMath.

So what you do think? Shall we merge it, are there any typos or mistakes? Any additions?

Best regards!
Since HTML5 its called description list ;-)