Congrats on shipping! How did you decide which code/commands to include in the book and which ones to publish online? This works well for ebooks (avoids errata), but is less convenient for readers of the paperback edition.
Do you mean the code that's on Github (like the installation instructions) and not in the paperback? The install stuff is online because I highly suspect it'll need to be updated often, and I didn't want the book to go out of date quickly. Let me know if I misunderstood the question!
I'm assuming/hoping that most paperback readers will still have a computer in front of them when going through the book since it's a tutorial, so hopefully opening up the GitHub code isn't that much of an inconvenience. If they're ideally reading without a computer, then missing that chapter shouldn't be a problem.