docs(looker-studio): update Columnar readme with new Couchbase link for setup information

- Revised the prerequisites section to replace the outdated Couchbase Columnar setup link with the current link to the Couchbase Analytics product page.
- Ensured clarity and accuracy in the documentation for users setting up the connector.

Files:
- tutorial/markdown/connectors/looker-studio/columnar/readme.md

Author: teetangh

tutorial/markdown/connectors/looker-studio/columnar/readme.md

@@ -35,7 +35,7 @@ The connector authenticates with Basic Auth to the Columnar API (`/api/v1/reques
 
 ## Prerequisites
 
-- A Couchbase Columnar deployment reachable from Looker Studio. For setup information, see [Getting Started with Couchbase Columnar](https://docs.couchbase.com/columnar/current/get-started/index.html).
+- A Couchbase Columnar deployment reachable from Looker Studio. For setup information, see [Getting Started with Couchbase Columnar](https://www.couchbase.com/products/analytics/).
 - A database user with permissions to read from the target Tabular Analytics Views (TAVs) and execute queries.
 - Network access from Looker Studio to your Columnar host.