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

thinkcspy/Chapter-6-Exercises/problem3.py

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+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 3
+
+import turtle
+
+def drawPolygon(t, sideLength, numSides):
+    """Make turtle t draw a polygon."""
+    angle = 360/numSides
+    
+    for i in range(numSides):
+        t.forward(sideLength)
+        t.left(angle)
+
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+tess = turtle.Turtle()
+tess.color("pink")
+tess.pensize(2)
+
+drawPolygon(tess,50,8) 
+
+wn.exitonclick()