add ai-delegate server

I have added a new docker container to support some fixes and future development in ai-delegate, and I have also retooled the way the local dev environment works.

To the second point, there were a couple of problems with Pete's approach, the main one being that the image names were changed, but also the naming of the alternate file was undesirable and it created two parallel files to maintain (in fact, my change adding the generator was already left out there).

This override-based approach is much cleaner. To use, leave it as-is; to ignore it, delete or otherwise disable the override file.