[STALLED] Add necessary changes to allow start from one docker-compose for SSHOC

All files were placed in etc/sshoc-start-order. docker-compose was moved there, and unused entrypoint was removed. Unfortunately, nearly all the images require rebuild, but changes are minor and startup from fresh docker took just a few minutes at my station. I am not sure if build: directive in docker-compose will work with Portainer, but if not, users will need to build all images from provided Dockerfiles, tag and push these somewhere, to be used as ready images in Portainer.