Adds an entry to the Concepts section that gives an overview of the feature
and builds upon the generated API documentation.
Also adds a Glossary entry for shuffle sharding.
Co-Authored-By: Tim Bannister <tim@scalefactory.com>
Co-Authored-By: Mike Spreitzer <mspreitz@us.ibm.com>
Co-authored-by: Tim Bannister <tim@scalefactory.com>
Co-authored-by: Mike Spreitzer <mspreitz@us.ibm.com>
Jonathan Klabunde Tomer