Remove Sourcerer's hall of fame (#5168)

Sourcerer is gone: sourcerer-io/sourcerer-app#632

Author: skshetry

README.rst

@@ -201,38 +201,6 @@ Contributing
 Contributions are welcome! Please see our `Contributing Guide <https://dvc.org/doc/user-guide/contributing/core>`_ for more
 details.
 
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-.. image:: https://sourcerer.io/fame/efiop/iterative/dvc/images/6
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 Mailing List
 ============