I'd suggest we stick with the term "codelab". 

https://github.com/GoogleChrome/chrome-app-codelab
https://www.dartlang.org/codelabs/darrrt/
https://developers.google.com/events/6193732990795776/

In addition to the SEO concerns of changing the name and probably URL, a codelab is something compartmentalised that people expect to always be up to date (which we've tried doing here) but could be walked through at an event or workshop. I'd love for us to maintain the idea that anyone could take this and host a session with it at their event.

A tutorial would be the same content but I don't think it has the same connotations.