Replace yaml-based projects settings with database

[lukpueh]

Currently, project data used for authentication is maintained in projects.yaml, which is read once at app start-up.

This is a stopgap solution for an early prototype. Moving forward we will want a simple db ¹ to allow updating project data without restarting the app.

The change is also desirable for our Kubernetes deployment, where we create projects.yaml from a helm values file, which is not supposed to be updated as regularly, as we will need to update project data. cc @TiagoLucas22478

Footnotes

1. sqlite might be good enough: small data set, rare concurrent reads, no concurrent writes ↩