Standalone - update nginx template link

Add link to template from this MR (once merged) https://github.com/civicrm/civicrm-standalone/pull/13

docs/standalone/index.md

@@ -228,7 +228,7 @@ The exact steps vary based on your specific environment. Here are some typical t
 
 ??? example "_nginx_: Configure a virtual-host on Debian-based server"
 
-    (*Example nginx virtual host config is in progress - check https://github.com/civicrm/civicrm-standalone for updates - contributions welcome! *)
+    An example starting point for nginx virtual host configuration is available in the [CiviCRM Standalone repository](https://github.com/civicrm/civicrm-standalone).
 
 
 ## Step 7. Configure webserver permissions {:#webserver}