Last modified: 2012-11-28 14:04:06 UTC
There should be a setting or something to set the Main Page on the repo, such as to something in another namespace and have content. Currently, "Main page" shows: "This data set does not exist. You can search the related logs to find out where it went. You can also create a new one." which is not too nice for production :)
That is already possible and done on the demo.
You need to set MediaWiki:Mainpage to point to the desired main page. All installed repos should have that set, or is there one that does not?