Request: Add example usage alongside each API documentation

The [class summary](https://pythonhosted.org/cadquery/classreference.html) is detailed and very helpful, however, it would be awesome if each documented API also included a couple of example use cases. The [examples](https://pythonhosted.org/cadquery/examples.html) page, though a good starting point, doesn't cover advanced use cases for cadquery, so having this additional resource to turn to would be very helpful.