Update jobs messaging in footer (?)

[david-davidson]

Hey, I noticed that we just updated formidablelabs.com/careers to say that there aren't any open job listings right now: https://github.com/FormidableLabs/formidablelabs.com/pull/122

Given that update, I wonder if we should modify the footer here, which says "We're hiring"? (Kind of frustrating to click through from that and see that we're not hiring. ;) If so, I suppose we'd want to roll out the same update to Radium and other high-profile public repos with similar footers.

/cc @rgerstenberger @alexlande