Investigate specific views for API routes

[mcab]

Instead of serializing the entire model on any particular view, we can have the default GET request for all resources and the default GET request for a specific instance (PK) have different views, to not have to retrieve / send a lot of data over the API.

[mcab]

Resources:

• The API for serializers
• Using class-based views versus the current viewsets (due to trade-off.)