You can either look at the walkthrough as a single long document, or broken up into the same [chapter structure](./chapters/01 - intro.md) as the original tutorial.
If you'd like to play with the vanilla version locally, run any webserver from the docs/vanilla directory.
If you don't have one, an easy choice is http-server from npm.
npm install -g http-server
cd docs/vanilla
http-server .
You should now be able to hit, or alter, the vanilla version from localhost:8080 .