Fix forwarding from http to https on nginx

The forwarding currently don't work - the nginx tries to resolve all the urls it gets on port 80 to be static files. As far as I can see it, it depends on where the nginx default.conf is mounted. When it is mounted under default.conf, everything is fine. When another name is used, then there is still the old config, which tries to resolve the urls as static files.

I fixed it locally for !233 (merged), so I think I can provide the general patch for this as well.