moving out outdated js docs

olddocs/js/lessons/flipping-bird/challenges.md

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+# flipping bird challenges
+
+Coding challenges for flipping bird. #docs
+
+## Before we get started
+
+Complete the following guided tutorial:
+
+* [tutorial](/lessons/flipping-bird/tutorial)
+
+At the end of the tutorial, click `keep editing`. Your code should look like this:
+
+```
+counter = 0
+input.onGesture(Gesture.Shake, () => {
+    counter = counter + 1
+    if (math.mod(counter, 2) == 1) {
+        basic.plotImage(`
+# # . # #
+. . # . .
+. . . . .
+. . . . .
+. . . . .
+`)
+    }
+})
+```
+
+### Challenge 1
+
+We handled the case of when `math->mod(counter,2) = 1`. We haven't done anything when the remainder is 0! Add an if statement to handle this case.
+
+```
+counter = 0
+input.onGesture(Gesture.Shake, () => {
+    counter = counter + 1
+    if (math.mod(counter, 2) == 1) {
+        basic.plotImage(`
+# # . # #
+. . # . .
+. . . . .
+. . . . .
+. . . . .
+`)
+    }
+    if (math.mod(counter, 2) == 0) {
+    }
+})
+```
+
+### Challenge 2
+
+### @video td/videos/flipping-bird-2
+
+Inside of that `if` statement you created in challenge 1, add `basic->plot image()` and display an upside down flying bird.
+
+```
+counter = 0
+input.onGesture(Gesture.Shake, () => {
+    counter = counter + 1
+    if (math.mod(counter, 2) == 1) {
+        basic.plotImage(`
+# # . # #
+. . # . .
+. . . . .
+. . . . .
+. . . . .
+`)
+    }
+    if (math.mod(counter, 2) == 0) {
+        basic.plotImage(`
+. . . . .
+. . . . .
+. . . . .
+. . # . .
+# # . # #
+`) // ***
+    }
+})
+```
+
+* `Run` the code to see if it works as expected.
+
+**Challenge 3**
+
+Display a check mark and question mark instead of flipping birds. Or better yet, come up with your own pair of opposites to display!
+