@allenrabinovich updated the Zulip UI in February 2014. However, we never updated the screenshots on /hello to match.
It'd be nice to move away from images entirely and just embed the Zulip CSS, but I don't know if our CSS is sufficiently modular for that. So for this task, simply take new screenshots (preferably with the same copy) and cut a PR.
(This would be easier with #1525.)