fix(bookstack): use Recreate rollout strategy (DEV-528)

BookStack is a single-replica Deployment backed by a ReadWriteOnce
PVC (`bookstack-config`). The default RollingUpdate strategy creates
the new pod before terminating the old one, and the two pods cannot
share the RWO volume — so every rollout deadlocks on
`Multi-Attach error for volume`.

Switching to `strategy: Recreate` terminates the old pod first,
releases the PVC, and then starts the new pod. Brief downtime is
expected on rollout, but rollouts actually complete.

Discovered while rolling out the `/status` probe fix (previous commit).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/bookstack/bookstack-deployment.yaml

@@ -100,6 +100,8 @@ metadata:
   namespace: bookstack
 spec:
   replicas: 1
+  strategy:
+    type: Recreate
   selector:
     matchLabels:
       app: bookstack