Point at the playbook's new home

The playbook now lives in ansible-playbooks/menu-admin/ with the other
playbooks; a second copy here would be edited by mistake.

README.md

@@ -40,8 +40,12 @@ config/                   Per-Site config, one file per Site
 test/                     node:test suites
 docs/plan.md              The agreed plan
 docs/adr/                 Decisions worth remembering
+deploy.sh                 Tests, build, push
 ```
 
+The Ansible playbook lives in `ansible-playbooks/menu-admin/`, beside the other
+playbooks, because that is where it is run from.
+
 ## Working on it
 
 Node 24 or newer runs the TypeScript sources directly.