The creation and update features of the app has been implemented.
Redundant user handling has been removed and is wholly managed by
Auth0.

The UUID library now uses overrides instead of the inherited Buffer
methods for better deserialization.

TODO: add conversions across layers from database to controller.

There is initial effort in implementing Auth0.

Separate reusable code from service-core.

Add integration tests and organize them by requirements.

Scaffold backend with Fastify CLI and replace Tap with Jest for
consistency.