Add PostgreSQL example dashboard link (#93854)

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/datasources/postgres/_index.md

@@ -66,6 +66,8 @@ For instructions on how to add a data source to Grafana, refer to the [administr
 Only users with the organization administrator role can add data sources.
 Administrators can also [configure the data source via YAML](#provision-the-data-source) with Grafana's provisioning system.
 
+{{< docs/play title="PostgreSQL Overview" url="https://play.grafana.org/d/ddvpgdhiwjvuod/postgresql-overview" >}}
+
 ## PostgreSQL settings
 
 To configure basic settings for the data source, complete the following steps: