[Twisted-Python] twisted site should link to tx site ...

[Stephen Waterbury]

This url should really be linked either from Twisted's main page
or at the very least on the "Twisted Community" page:

https://launchpad.net/tx

Lots of tx stuff that's not in PyPI, etc ... sheesh!  Also,
if you do a search on "tx" in the twisted site "search" it says
"search query too short", and the string "tx" is not found on
either the main page or the community page at all.

To be fair, googling on "twisted tx" gets the launchpad site as
the second hit, but what if someone doesn't know about the "tx"
thing?

Steve