Converts "Deep Learning on MNIST" tutorial to md.

Author: melissawm

README.md

@@ -17,8 +17,9 @@ or navigate to any of the documents listed below and download it individually.
 0. [Learn to write a NumPy tutorial](content/tutorial-style-guide.md): our style guide for writing tutorials.
 1. [Tutorial: Linear algebra on n-dimensional arrays](content/tutorial-svd.md)
 2. [Tutorial: CS231n Python Tutorial](content/cs231_tutorial.md)
-3. [Tutorial: Determining Moore's Law with real data in NumPy](content/mooreslaw-tutorial.ipynb)
-4. [Tutorial: Saving and sharing your NumPy arrays](content/save-load-arrays.ipynb)
+3. [Tutorial: Determining Moore's Law with real data in NumPy](content/mooreslaw-tutorial.md)
+4. [Tutorial: Saving and sharing your NumPy arrays](content/save-load-arrays.md)
+5. [Tutorial: NumPy deep learning on MNIST from scratch](content/tutorial-deep-learning-on-mnist.md)
 
 ## Contributing