refactor(metal): remove shutdown playbook

Use ansible-console instead

metal/Makefile

@@ -17,10 +17,5 @@ cluster:
 		--inventory inventories/${env}.yml \
 		cluster.yml
 
-shutdown:
-	ansible-playbook \
-		--inventory inventories/${env}.yml \
-		shutdown.yml
-
 vagrant:
 	vagrant up

metal/shutdown.yml

@@ -1,11 +0,0 @@
-- name: Shutdown the homelab
-  hosts: metal
-  gather_facts: false
-  tasks:
-    - name: Unconditionally shut down the machine
-      community.general.shutdown:
-        delay: 0
-      ignore_unreachable: true
-    - name: Wait for the machine to shutdown
-      shell: "until ! ping -c 1 {{ ansible_host }}; do sleep 1; done"
-      delegate_to: localhost