Currently, we do not show notebook outputs. It would be helpful to do so. However, we do not want to store the outputs in Git because they pollute diffs.

We should investigate the solution used by Scikit-learn:

• No output in Git:
  https://github.com/scikit-learn/scikit-learn/blob/master/examples/datasets/plot_digits_last_image.py
  https://github.com/scikit-learn/scikit-learn.github.io/blob/master/dev/_downloads/plot_digits_last_image.ipynb
• Output on the web:
  http://scikit-learn.org/stable/auto_examples/datasets/plot_digits_last_image.html