Update index.html with fancier CSS

Version 2.0.1-20140830B-REVα

I considered using Flexbox but didn’t want to deal with all the extra
prefixes and old syntax or *shudder* a polyfill for compatibility.

- Set HTML5 doctype.
- Remove unneeded DIV.outer.
- Use HTML5 elements to offer better semantic meaning.
- Restyle with absolute positioning.
- Position with CSS3 rem units.
    * No fallback fractional em units; IE8 needs to die.
- Set font-family to Hoefler Text (with generic serif fallback) simply
  for that gorgeous ff ligature.

Just thought I'd lend you a hand. :-)