Thanks Kinnard! We had been using the Sphinx documentation engine to produce the version linked. We have spent the last year writing our own static site generator system alongside making the whole website open source. We are very happy with the result and looking forward to supporting more languages and curriculums soon.
We have pushed through the update, may still be some caching issues. Try loading http://www.csfieldguide.org.nz/ with a clear cache (or in an incognito browser), you should see a page with an indigo background. The Sphinx version is our old website.