chore: Add link to iframe viewer documentation in app.py

app.py

@@ -89,6 +89,7 @@ try:
         1. Duplicate this space
         2. In your duplicated space, set the `COLLECTION_SLUG_OR_URL` environment variable to your desired collection ID or URL
         3. Your new space will then display datasets from your chosen collection!
+        Checkout the [docs](https://huggingface.co/docs/hub/datasets-viewer-embed) for other ways to use the iframe viewer.
         """)
         left_btn.click(
             navigate_dataset,