Welcome to the Explore Flask repository. This is where the reStructuredText source of the book lives. If you're looking to read the book itself, go here.
If you have some ideas for the book, you can open up an issue in the issue tracker or submit a pull request. If you're making some big changes, it's probably best to suggest them first in the issue tracker so we can discuss whether or not they belong in the book before you do all of the work.
Contributions are all placed in the public domain like the rest of the text.
Just cd into the repo and run sphinx-build -b html source/ build/ to build the website. Feel free to try your hand at building other formats, but HTML is the only officially supported one right now.