Revert "typo fix on thanks page"

This reverts commit 0b63fc3b07661dd826fd74e69711c0cec5c73dba.
Revert "Adding UserVoice and GoSquared to the thanks page as part of the new site launch."

This reverts commit a4a8a6eb4693112058e6d39750337a3fa8976b09.
Try to make sense of this
PHP doesn't really power facebook
Prettify the the right bar a little

Split the conference panel into cfp and confs
And add a link to te 5.5 migration guide
whooops :D