That is the source material for the book. It was loaded by Jake to Azure Notebooks.
You can load any github repo by creating a Library (a repo basically), and +New / Load from github. It'll load the notebooks, data, etc. You can then run the notebooks.
Sorry for those of you with slow load times. We had a perf issue with our server side rendering of the Angular app which was avoided by going to the front page. We temporarily disabled that and now things should be snappy again!
https://notebooks.azure.com
Then on the top "Featured" carousel click the link for Jake's book.
If you just want to view, try the 'notebooks' directory to see HTML rendered view of the book.
If you want to Run/Edit/etc the book:
1) Sign in - any gmail, outlook etc email will do. 2) Clone the book 3) Run! (Cell/RunAll)