Track the nginx-menu playbook as it stands

It has been serving three menu Sites from an untracked directory, so today's
state was not reproducible or revertible.

nginx-menu/roles/caddy/handlers/main.yaml

@@ -0,0 +1,5 @@
+---
+# Handlers for Caddy role
+- name: Reload Caddy configuration
+  ansible.builtin.command: "docker exec -w /etc/caddy {{ caddy_container }} caddy reload"
+  listen: "Reload Caddy"