Add Pi Zero OTG, sense hat examples and more docs

docs/examples/sense_hat_remote_2.py

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+from gpiozero import LightSensor
+from gpiozero.pins.pigpio import PiGPIOPin
+from sense_hat import SenseHat
+
+light = LightSensor(PiGPIOPin(4, host='192.168.1.4'))  # remote motion sensor
+sense = SenseHat()  # local sense hat
+
+blue = (0, 0, 255)
+yellow = (255, 255, 0)
+
+while True:
+    if light.value > 0.5:
+        sense.clear(yellow)
+    else:
+        sense.clear(blue)