Introduce everything playbook, which runs all non-initial setup roles

It runs the maintenance playbook and then all other non-initial setup
roles, which aren't covered by the maintenance playbook.

playbooks/everything.yaml

@@ -0,0 +1,7 @@
+- name: Run maintenance playbook
+  ansible.builtin.import_playbook: maintenance.yaml
+
+- name: Ensure Docker for Docker_Hosts
+  hosts: Docker_Hosts
+  roles:
+    - docker