Remove docker-compose.yml.dev

[morucci]

This version of the docker-compose was initially made to ease development of Monocle. Now the CONTRIBUTING.md documentation no longer encourage its usage.

It is then time to remove it.

• [ ] Update Makefile and docker-compose.dhall to remove the dev version of the compose.
• [ ] Rename docker-compose.yml.img to docker-compose.yml and reflect changes in the README.md
• [ ] Provide a Makefile command to build the images of Monocle
• [ ] Update GitHub actions to use the new Makefile command and use the locally built images with the docker-compose.yml file