[epic] Bridge the gap between aegir5 and drumkit
This is a key next step in terms of getting Aegir5 to an MVP. We have a Drupal frontend Drupal that roughly mirrors the Aegir3 interface; this will need some re-working to accommodate our current thinking of how the backend works. We also have a Drumkit backend proof-of-concept that allows us to provision Kubernetes-hosted Drupal sites. The current frontend assumes our older Ansible-based backend, but we want to adjust so it calls the Drumkit backend instead.