avoids warnings in pihole such as :
Warning in dnsmasq core: reducing DNS packet size for nameserver 127.0.0.1 to 1280
from pihole's doc : https://docs.pi-hole.net/guides/dns/unbound/
Adding a 2nd docker-compose config for running both Pi-Hole and Unbound in the same container (following recommended steps in the Pi-Hole docs).
Restructuring the project to maintain the old 2-container setup as well.