v5 - Metabase and refactored flows

The most significant change for this release is the optional docker-compose.yaml file that allows running Metabase alongside Gregory.

Metabase is available at https://www.metabase.com/ and @metabase.

Content pages were updated, and algolia was removed from the search page in favor of a Metabase dashboard that allows for less dependencies and is always up to date.