Fix postgres/supabase recipe: correct broken PostgreSQL connector docs link

Connector docs moved under /components/. https://docs.spiceai.org/data-connectors/postgres
now 404s; the live page is https://docs.spiceai.org/components/data-connectors/postgres.

Author: Claude

postgres/supabase/README.md

@@ -39,7 +39,7 @@ insert into spice_test (value) values (10), (20), (30), (40), (50);
     pg_sslmode: require
 ```
 
-See the [datasets reference](https://docs.spiceai.org/reference/spicepod/datasets) for more dataset configuration options and [PostgreSQL Data Connector](https://docs.spiceai.org/data-connectors/postgres) for more options on configuring a PostgreSQL Data Connector.
+See the [datasets reference](https://docs.spiceai.org/reference/spicepod/datasets) for more dataset configuration options and [PostgreSQL Data Connector](https://docs.spiceai.org/components/data-connectors/postgres) for more options on configuring a PostgreSQL Data Connector.
 
 Ensure the `PG_PASS` environment variable is set to the password for your Supabase instance. Environment variables can be specified on the command line when running the Spice runtime, or in a `.env` file in the same directory as `spicepod.yaml`.