[Twisted-Python] Proposed new homepage

[Itamar Turner-Trauring]

Our current page is not good at pulling in potential new users:

      * There's no quick examples of how nice Twisted is.
      * It takes 3 clicks (3!) to find basic documentation, with lots of
        scope for getting lost along the way.

I propose to fix this by adding code examples, and relevant direct
documentation links. A very preliminary pass, still lacking things like
syntax highlighting, can be found here:

http://twistedmatrix.com/trac/wiki/ProposedWikiStart

What do you think?