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Solr 8 config files are now provided at solr/conf for experimentation with upgrading and is the default in the docker-compose development environment.  Upgrade tooling and documentation for production environments will be available in a future avalon release.  Solr 6 config files are still available at solr/config.

The default branch of the avalon github repository has been renamed to main in line with the Samvera contributing guidelines.

Rails/Blacklight/Bootstrap Upgrades and Styling

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