add postgres to intro (#2230)

Author: jerrylin3321

pages/docs/tracking-methods/warehouse-connectors.mdx

@@ -9,7 +9,7 @@ import { dwhItems, mirrorItems } from '../../../utils/constants';
 Warehouse Connector is a free add-on available to organizations on a Growth or Enterprise plan. Learn more on our [pricing page](https://mixpanel.com/pricing/).
 </Callout>
 
-With Warehouse Connectors, you can sync data from data warehouses like Snowflake, BigQuery, Databricks, and Redshift to Mixpanel. By unifying business data with product usage events, you can answer many more questions in Mixpanel:
+With Warehouse Connectors, you can sync data from data warehouses like Snowflake, BigQuery, Databricks, Redshift, and Postgres to Mixpanel. By unifying business data with product usage events, you can answer many more questions in Mixpanel:
 * What percentage of our Enterprise revenue uses the features we shipped last year?
 * Did our app redesign reduce support tickets?
 * Which account demographics have the best retention?