Fix broken pre-post-sync example (#37)

pre-post-sync/kustomization.yaml

@@ -1,7 +1,8 @@
 namePrefix: pre-post-sync-
 
+bases:
+- ../kustomize-guestbook
+
 resources:
-- ../guestbook/guestbook-ui-deployment.yaml
-- ../guestbook/guestbook-ui-svc.yaml
 - pre-sync-job.yaml
 - post-sync-job.yaml