* move ldap to its own file
* add separate files for db and mail as well
* add new compose file to the default compose_file variable
* enhance setup.sh to add these new compose files if they are currently missing
* move portmapping into docker-compose.ports.yml
Ensure loading of docker-compose.ports.yml via COMPOSE_FILE in .env.
* instruct users to put overridden ports into override.yml