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/robot_keyboard_1.py

@@ -0,0 +1,34 @@
+import curses
+from gpiozero import Robot
+
+robot = Robot(left=(4, 14), right=(17, 18))
+
+actions = {
+    curses.KEY_UP:    robot.forward,
+    curses.KEY_DOWN:  robot.backward,
+    curses.KEY_LEFT:  robot.left,
+    curses.KEY_RIGHT: robot.right,
+    }
+
+def main(window):
+    next_key = None
+    while True:
+        curses.halfdelay(1)
+        if next_key is None:
+            key = window.getch()
+        else:
+            key = next_key
+            next_key = None
+        if key != -1:
+            # KEY DOWN
+            curses.halfdelay(3)
+            action = actions.get(key)
+            if action is not None:
+                action()
+            next_key = key
+            while next_key == key:
+                next_key = window.getch()
+            # KEY UP
+            robot.stop()
+
+curses.wrapper(main)