Convert recipe examples to includes

Makes it much easier to test things - no copying'n'pasting just run the
examples straight from the dir (after wiring stuff up)

docs/examples/led_board_1.py

@@ -0,0 +1,15 @@
+from gpiozero import LEDBoard
+from time import sleep
+from signal import pause
+
+leds = LEDBoard(5, 6, 13, 19, 26)
+
+leds.on()
+sleep(1)
+leds.off()
+sleep(1)
+leds.value = (1, 0, 1, 0, 1)
+sleep(1)
+leds.blink()
+
+pause()