move lessons out of web site

will move select lessons back to "educators" section

docs/lessons/glowing-pendulum/tutorial.md

@@ -1,29 +0,0 @@
-# glowing pendulum block tutorial
-
-The glowing pendulum changes the screen brightness based on the acceleration measured on the BBC micro:bit.
-
-### Rebuild the game!
-
-The blocks have been shuffled! Put them back together so that...
-* all LEDs are turned on
-* the BBC micro:bit repeats code **forever** that
-  * reads the acceleration along the ``y`` axis,
-  * calculate the absolute value of the acceleration
-  * scales down the acceleration value by a factor of `4`
-  * uses the scaled value to set the screen **brightness**
-
-```blocks
-basic.showLeds(`
-    # # # # #
-    # # # # #
-    # # # # #
-    # # # # #
-    # # # # #
-    `)
-basic.forever(() => {
-    let acceleration = input.acceleration(Dimension.Y);
-    acceleration = Math.abs(acceleration);
-    acceleration = acceleration / 4;
-    led.setBrightness(acceleration)
-});
-```