Stabilized autobuilds and stripped release image

I have this pretty much where I feel good about letting it out into the wild. The automatic builds are working and I've got the stripped release image down to 1.367 GB. I still need to do some documentation, but there's a working start on the Windows user guide at <https://github.com/znmeb/overview-server/blob/master/znmeb-release/Windows.md>. I'm planning to finish that up tomorrow.

The stripped release is on Docker Hub at <https://registry.hub.docker.com/u/znmeb/overview-stripped/>. I still have to do those manually but they run very quickly - the biggest component is pushing the layers that have changed up to Docker Hub.