Demo landing v2

Demo landing v2


Since the demos and docs are being combined into one page, we need to
tweak the landing page to accommodate the developer and theming docs.
This is my proposed design to add that in without re-working too much:
http://jqueryui.pbwiki.com/f/demo_landing_v2.png
I works pretty well and makes the page feel a fit more finished. In
addition to hard-coding these links into the existing landing page, we
also need to add these to the left nav of all the detail pages (at the
bottom of the lest, below effects?)
The big question is how are these pages going to be built? They really
need to be pulled into the UI site from the jQ wiki, but how? Can this
be pulled in like the docs or do we need to manually copy and paste
this stuff over?
If this looks good, we can code these links into the landing page and
left nav.