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

thinkcspy/Chapter-5-Exercises/problem19.py

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+# Runestone.Academy thinkcspy course
+# Chapter 5
+# Problem 19
+
+import math
+
+c = float(input("Today we are going to calculate pi from the dimensions of a circle. What is the circumference of your circle?"))
+d = float(input("And what is the diameter of your circle?"))
+               
+zpi = c/d
+
+print("The approximate value of pi from the dimensions provided is", zpi)
+print("The actual (also technically approximate) value of pi is", math.pi)