Noves-Inc/canton-data-app: docs/migrate-v3.16.1.md

# Migrate from v3.16.1 to v4 of the Noves Data App v4 of the Noves Data App upgrades databases from v3.16.1. If you run an older v3 release, upgrade it to v3.16.1 and confirm that it works before starting this procedure. If your app is running on the v3.16.1 version, the last database schema (which