Handle 404s when dynamic paths don't point to an existing entity

[deammer]

When using dynamic paths like /shipment/:shipmentId, we need to fail gracefully in case the shipmentId doesn't exist.

We should also handle invalid IDs, like "abc123" for example.

• make inventory of all dynamic routes
• update components that render dynamic routes and add a "entry not found" message in case the requested entries cannot be resolved.