Ch8 Alt Text

- [X] 8.0 current alt="function execution" 
- [X] 8.1 heights.scatter('Parent Average')
- [X] 8.1 plots.scatter(68, 67.62, color='gold', s=40);
- [X] 8.1 heights_with_predictions.scatter('Parent Average')
- [X] 8.3 distributions.select(0, 1, 4).barh(0)
- [X] 8.5 commute.hist('Duration', unit='Second')
- [X] 8.5 commute.hist('Duration', bins=60, unit='Second')