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

thinkcspy/Chapter-8-Exercises/Problem8.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 8
+
+import image
+
+def greyScale (red, blue, green):    
+    return (red + blue + green)/3
+
+img = image.Image("luther.jpg")
+win = image.ImageWin(img.getWidth(), img.getHeight())
+img.draw(win)
+img.setDelay(0)   # setDelay(0) turns off animation
+
+for row in range(img.getHeight()):
+    for col in range(img.getWidth()):
+        p = img.getPixel(col, row)
+        
+        pixelColor = greyScale(p.getRed(), p.getGreen(), p.getBlue())
+
+        newblue = newgreen = newred = pixelColor
+        
+        newpixel = image.Pixel(newred, newgreen, newblue)
+
+        img.setPixel(col, row, newpixel)
+
+img.draw(win)
+win.exitonclick()