Reorder README sections #1366

Job	Run time
build (examples/minimal_app.cpp, esp32dev)	1m 18s
build (examples/analog_input.cpp, esp32dev)	1m 29s
build (examples/hysteresis.cpp, esp32dev)	1m 27s
build (examples/lambda_transform.cpp, esp32dev)	1m 24s
build (examples/manual_networking.cpp, esp32dev)	1m 22s
build (examples/minimal_app.cpp, esp32dev)	1m 21s
build (examples/rpm_counter.cpp, esp32dev)	1m 30s
build (examples/async_repeat_sensor.cpp, esp32dev)	1m 29s
build (examples/repeat_sensor_analog_input.cpp, esp32dev)	1m 23s
build (examples/freertos_tasks.cpp, esp32dev)	1m 26s
build (examples/raw_json.cpp, esp32dev)	1m 23s
build (examples/constant_sensor.cpp, esp32dev)	1m 36s
build (examples/time_counter.cpp, esp32dev)	1m 23s
	18m 31s

Provide feedback