Remove example use cases from docs (#4775)

Co-authored-by: Abhi Vaidyanatha <[email protected]>

Author: avaidyanatha

docs/SUMMARY.md

@@ -25,11 +25,6 @@
     * [Transformations with SQL \(Part 1/3\)](operator-guides/transformation-and-normalization/transformations-with-sql.md)
     * [Transformations with dbt \(Part 2/3\)](operator-guides/transformation-and-normalization/transformations-with-dbt.md)
     * [Transformations with Airbyte \(Part 3/3\)](operator-guides/transformation-and-normalization/transformations-with-airbyte.md)
-* [Example Use Cases](examples/README.md)
-  * [Postgres Replication](examples/postgres-replication.md)
-  * [Build a Slack Activity Dashboard](examples/build-a-slack-activity-dashboard.md)
-  * [Visualizing the Time Spent by Your Team in Zoom Calls](examples/zoom-activity-dashboard.md)
-  * [Save and Search Through Your Slack History on a Free Slack Plan](examples/slack-history.md)
 * [Connector Catalog](integrations/README.md)
   * [Sources](integrations/sources/README.md)
     * [Amazon Seller Partner](integrations/sources/amazon-seller-partner.md)