Moving setup into its own role, where we just set up the system configuuration for running k3s'

docker-host/roles/setup/handlers/docker-cleanup.yml

@@ -0,0 +1,6 @@
+- name: Cleanup old containers
+  become: yes
+  become_method: sudo
+  listen: cleanup-docker
+  command: docker images | grep none | awk '{print $3}' | xargs docker rmi
+    

docker-host/roles/setup/handlers/nginx.yml

@@ -0,0 +1,6 @@
+- name: Restart Nginx
+  listen: restart-nginx
+  service:
+    name: nginx
+    state: restarted
+