Revert "docs: add connector libraries overview table to package README (#17939)"

This reverts commit 4511991.

Author: daniel-sanche

packages/google-cloud-bigquery/README.rst

@@ -21,26 +21,6 @@ processing power of Google's infrastructure.
 .. _Client Library Documentation: https://cloud.google.com/python/docs/reference/bigquery/latest/summary_overview
 .. _Product Documentation: https://cloud.google.com/bigquery/docs/reference/v2/
 
-
-Related Libraries
------------------
-
-For higher-level data analysis and DataFrame operations, consider using one of the following connector libraries:
-
-.. list-table::
-   :header-rows: 1
-
-   * - Library
-     - Description
-     - Documentation
-   * - `BigQuery DataFrames (bigframes) <https://dataframes.bigquery.dev/>`_
-     - Flexible pandas-like and scikit-learn-like API powered by BigQuery engine for large-scale data analysis and ML.
-     - `BigFrames Docs <https://dataframes.bigquery.dev/>`_
-   * - `pandas-gbq <https://pandas-gbq.readthedocs.io/>`_
-     - Convenient integration allowing pandas DataFrames to load from and write to BigQuery.
-     - `pandas-gbq Docs <https://pandas-gbq.readthedocs.io/>`_
-
-
 Quick Start
 -----------