Replace qcompile with SerialCompiler in tests and documentation
`qcompile` is deprecated and all references to `qcompile` in the tests and documentation should be replaced by something based on `SerialCompiler`. Similar to what is done in !516.
Code snippet to help out future developers assigned to this task:
``` python
quantum_device = QuantumDevice()
quantum_device.hardware_config(hardware_cfg)
# setup qubits and stuff
...
compiler = SerialCompiler(name="compiler")
compiled_sched = compiler.compile(
schedule=schedule, config=quantum_device.generate_compilation_config()
)
```
issue