First "Released" version of Splainer as we now have a official Solr package.

2.20.1 (2023-08-07)

Introduce versioning to the Splainer project. The http://splainer.io website has been around for years, and we've just pushed changes as they arrive. We are now introducing a changelog process, and labeling the current state as "2.20.1" to match the commit 46cded0#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519.
Splainer.io can NOW be deployed into your Solr environment using Solr Packages. See the package README.md for more details. #97.

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