I just replaced an old site with .html pages with a new gocentral site at the same domain name. But google still has all my old pages indexed, and they all lead to 404 error pages. Is there a way to put a custom 404 page in place to send visitors to my new home page? Or can I force a GoCentral page to have a .html extension so I can replace the old pages? Or do I really have to just wait for google to index my new pages? (Please tell me that's not the case!) I looked in settings, where I can do all kinds of things like add a favicon, and I expected to see a custom 404 option, but no luck. Any ideas?