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/files/nginx.conf.j2

@@ -0,0 +1,24 @@
+server {
+   listen 80;
+   server_name {{ host }};
+
+  location /bar {
+    root /var/lib/menu.greatbear.in;
+    index index.html;
+  }
+
+  location /food {
+    root /var/lib/menu.greatbear.in;
+    index index.html;
+  }
+
+  location /delivery {
+    root /var/lib/menu.greatbear.in;
+    index index.html;
+  }
+
+  location /qr {
+    root /var/lib/menu.greatbear.in;
+    index index.html;
+  }
+}