tools lessons (#1218)

* tools lessons

* updated summary

* more images

* wire up images

* fixing radio send-value

docs/projects/analog-pin-calibrator.md

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+# Analog Pin Calibrator
+
+Use this program to graph the analog value on pin ``P0``.
+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/projects/light-level-calibrator.md

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+# Light level Calibrator
+
+Use this program to graph the light level.
+Press ``A`` to scroll the value on the screen.
+
+```blocks
+let reading = 0
+basic.forever(() => {
+    reading = input.lightLevel()
+    led.plotBarGraph(
+        reading,
+        255
+    )
+    if (input.buttonIsPressed(Button.A)) {
+        basic.showNumber(reading)
+    }
+})
+```

docs/projects/servo-calibrator.md

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+# 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, angle - 5)
+    pins.servoWritePin(AnalogPin.P0, angle)
+    led.stopAnimation()
+})
+input.onButtonPressed(Button.B, () => {
+    angle = Math.min(180, angle + 5)
+    pins.servoWritePin(AnalogPin.P0, angle)
+    led.stopAnimation()
+})
+basic.forever(() => {
+    basic.showNumber(angle)    
+})
+pins.servoWritePin(AnalogPin.P0, angle)
+```

docs/projects/tools.md

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+# Tools
+
+## Calibration
+
+```codecard
+[{
+  "name": "Light Level Calibrator",
+  "description": "Calibrate light input",
+  "url": "/projects/light-level-calibrator",
+  "imageUrl": "/static/mb/projects/light-level-calibrator.png",
+  "cardType": "side"
+}, {
+  "name": "Analog Pin Calibrator",
+  "description": "Calibrate analog input",
+  "url": "/projects/analog-pin-calibrator",
+  "imageUrl": "/static/mb/projects/analog-pin-calibrator.png",
+  "cardType": "side"
+}, {
+  "name": "Servo Calibrator",
+  "description": "Calibrate a servo",
+  "url": "/projects/servo-calibrator",
+  "imageUrl": "/static/mb/projects/servo-calibrator.png",
+  "cardType": "side"
+}]
+```