Remove .md and image files and move python files into main chapter folders

thinkcspy/Chapter-6-Exercises/problem12.py

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+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 12
+
+import turtle
+
+def drawSprite(t, numSides, legLength):
+    angle = 360/numSides
+    
+    for i in range(numSides):
+        t.forward(legLength)
+        t.up()
+        t.forward(-legLength)    
+        t.right(angle)
+        t.down()
+
+
+wn = turtle.Screen()
+
+wn.bgcolor("tan")
+
+avery = turtle.Turtle()
+avery.color("brown")
+
+drawSprite(avery, 15, 120)
+
+    
+wn.exitonclick()