move lessons out of web site

will move select lessons back to "educators" section

docs/lessons/blink/challenges.md

@@ -1,79 +0,0 @@
-# blink blocks challenges
-
-Coding challenges for the blink tutorial 
-
-## Before we get started
-
-Complete the [blink](/lessons/blink/activity) activity and your code will look like this:
-
-```blocks
-basic.forever(() => {
-    led.plot(2, 2)
-    basic.pause(500)
-    led.unplot(2, 2)
-    basic.pause(500)
-})
-```
-
-### Challenge 1
-
-Let's display a "smiley face" on the screen! We'll start by plotting the eyes.
-
-Add `plot(1,1)` and `plot(3,1)` under `plot(2,2)` ; then add `unplot(1,1)`, `unplot(3,1)` and `unplot(2,2)` after `pause`. When you're ready, don't forget to run your code to try it out!
-
-```blocks
-basic.forever(() => {
-    led.plot(2, 2)
-    led.plot(1, 1)
-    led.plot(3, 1)
-    basic.pause(500)
-    led.unplot(2, 2)
-    led.unplot(1, 1)
-    led.unplot(3, 1)
-    basic.pause(500)
-})
-```
-
-### Challenge 2
-
-Let's add the code to plot the mouth by using `plot` and `unplot` to the following coordinates: (1,4), (2,4) and (3,4). When you're ready, don't forget to run your code to try it out!
-
-```blocks
-basic.forever(() => {
-    led.plot(2, 2)
-    led.plot(1, 1)
-    led.plot(3, 1)
-    led.plot(1, 4)
-    led.plot(2, 4)
-    led.plot(3, 4)
-    basic.pause(500)
-    led.unplot(2, 2)
-    led.unplot(1, 1)
-    led.unplot(3, 1)
-    led.unplot(1, 4)
-    led.unplot(2, 4)
-    led.unplot(3, 4)
-    basic.pause(500)
-})
-```
-
-### Challenge 3
-
-Let's keep using `plot` to convert the mouth into a smiley face.
-
-```` bitmatrix
-0 0 0 0 0
-0 1 0 1 0
-0 0 1 0 0
-1 0 0 0 1
-0 1 1 1 0
-````
-
-### Challenge 4
-
-Let's make it blink a bit faster. To do so, we need to reduce the amount of time used in ``pause`` to 100 milliseconds.
-
-### Challenge 5
-
-Create your own image by changing the coordinates in `plot` and `unplot`!
-