Permanently redirect domain to nodejs.org

[febLey]

Is there a reason why this site still exists?
If not, the domain should be redirected to nodejs.org

[mikeal]

I'd prefer a page that says something about the history and the merger. It would be good to reserve the io.js brand for something else in the future and it'll be awkward if it moves from a forward to a real website.

[Fishrock123]

We should keep it alive but mention that the project has merged with node.

[Fishrock123]

Closing in favor of #426