Add 1password link to deployment notes

DEPLOYMENT-NOTES.rst

@@ -4,7 +4,8 @@ Deployment notes
 - 2023-04-19
 
   The team switched from Slack to Zulip.
-  For the monitoring notifications to reach Zulip, a webhook bot has to be created in Zulip and a secret URL has to be constructed as described in `https://zulip.com/integrations/doc/grafana`_ and added to the ``private_keys`` directory.  See ``grid/local/private-keys/grafana-zulip-url`` for an example.
+  For the monitoring notifications to reach Zulip, a webhook bot has to be created in Zulip and a secret URL has to be constructed as described in `https://zulip.com/integrations/doc/grafana`_ and added to the ``private_keys`` directory (See ``grid/local/private-keys/grafana-zulip-url`` for an example).
+  Find the secret URL for production at `https://my.1password.com/vaults/7flqasy5hhhmlbtp5qozd3j4ga/allitems/rb22ipb6gvokohzq2d2hhv6t6u`_.
 
 - 2021-12-20