Deduplicate example notebooks

Currently we have two sets of example notebooks for Feast
1. [Examples](https://github.com/gojek/feast/tree/master/examples/basic)
2. [Docker compose](https://github.com/gojek/feast/tree/master/infra/docker-compose/jupyter/notebooks)

The docker compose notebooks can be deduplicated so that all examples are only contained in the root of the project. This would make management easier.