Repo naming changes

[diginc]

resolves #301

There were also a bunch of remnants of Alpine VS Debian image, and Debian still being in the tag didn't make sense to port over with the repo/org change.

The multi-arch-images are not a seperately named image anymore either since we're not doing a docker inc. 'Automated Build' we do not have restrictions imposed by that anymore. That's not to say this image's build isn't going to be automated, it will be.

[diginc]

Tests are still failing because of debian being in the tags. Having them as regression tests is important during refactoring so I'll address that in this PR too.

E       Failed: Unexpected exit code 125 for CommandResult(command='docker run -d -e ServerIP="1.2.3.4" -e DNS1="1.2.3.4" -e DNS2="2.2.3.4" --dns 127.0.0.1 -v /dev/null:/etc/pihole/adlists.default -e PYTEST="True" pi-hole:debian_amd64 tail -f /dev/null', exit_status=125, stdout=None, stderr="WARNING: Localhost DNS setting (--dns=127.0.0.1) may fail in containers.\nUnable to find image 'pi-hole:debian_amd64' locally\ndocker: Error response from daemon: pull access denied for pi-hole, repository does not exist or may require 'docker login'.\nSee 'docker run --help'.\n")