Most probably we are deploying some new cool features right now. This might take a minute or two, so by the time you return from the kitchen with a sandwich we'll probably be back online.
If you are not hungry, you can spend some time looking at this random picture of a kitten. Our studies show that constantly refreshing the main page until you stop seeing kittens makes our deploys faster.
If you got tired of kittens and we are still offline, you might want to check our status page.