Thanks to the great tool of Docbook we've created our new version of documentation. It covers from the basic usage of Ragic applications to basic and advanced development techniques that you should know.
We have a single file HTML version, multiple paged HTML, and a PDF version available online in our support center Let us know if there's anything we should add!
If you would like to learn how to set up docbook to create your own technical documents, I would be glad to help. E-mail me at firstname.lastname@example.org, it actually took me a while to organise the set of libraries to compile the docbook XML files to all types of document outputs.