Pi-Hole + Unbound on Docker

Use Docker to run Pi-Hole with an upstream Unbound resolver.

Changing this repo to support 2 different docker-compose configurations now:

• one-container (new) - Install Unbound directly into the Pi-Hole container
  • This configuration contacts the DNS root servers directly, please read the Pi-Hole docs on Pi-hole as All-Around DNS Solution to understand what this means.
  • With this approach, we can also simply our networking since macvlan is no longer necessary.
• two-container (legacy) - Use separate containers for Pi-Hole and Unbound
  • This configuration uses MatthewVance's unbound-docker container to implement encrypted DNS to third party DNS resolvers (eg Cloudflare). This is arguably less privacy-friendly since you're handing your DNS queries to those 3rd party providers.