Remove broken Get Satisfaction link from header

[toasterlovin]

I guess the other way to resolve this would be to recreate the Get Satisfaction account, but that is outside of my powers, hence this PR.

[reidab]

It looks like GetSatsifaction's current incarnation doesn't include the free plan that we were using, but it should still be online (based on other similarly-aged communities that I set up near the same time).

I can sign in and see some old topics, but I'm not an admin of that account. While I'd like to regain access to some of the threads there, I think it makes the most sense to remove the link and direct discussion here.