tools lessons (#1218)

* tools lessons

* updated summary

* more images

* wire up images

* fixing radio send-value

docs/examples/plot-analog-pin.md

@@ -1,18 +0,0 @@
-# Plot Analog Pin
-
-Use this program to graph the analog value on pin ``P0``, ``P1`` or ``P2``.
-Press ``A`` to scroll the value on the screen.
-
-```blocks
-let reading = 0
-basic.forever(() => {
-    reading = pins.analogReadPin(AnalogPin.P0)
-    led.plotBarGraph(
-        reading,
-        1023
-    )
-    if (input.buttonIsPressed(Button.A)) {
-        basic.showNumber(reading)
-    }
-})
-```

docs/examples/servo-calibrator.md

@@ -1,26 +0,0 @@
-# Servo calibrator
-
-Use this program to calibrate the angles of a servo.
-Press ``A`` to reduce the angle by 5 and ``B`` to
-increase it by 5.
-
-The current angle is displayed on the screen
-in a loop.
-
-```blocks
-let angle = 90
-input.onButtonPressed(Button.A, () => {
-    angle -= Math.max(0, 5)
-    pins.servoWritePin(AnalogPin.P0, angle)
-    led.stopAnimation()
-})
-input.onButtonPressed(Button.B, () => {
-    angle += Math.min(180, 5)
-    pins.servoWritePin(AnalogPin.P0, angle)
-    led.stopAnimation()
-})
-basic.forever(() => {
-    basic.showNumber(angle)    
-})
-pins.servoWritePin(AnalogPin.P0, angle)
-```