While supernova is a cool tool, it's difficult to actually do anything with the documentation if you don't have a paid membership. For this reason I'm reverting back to Word, but I really like the stylization of supernova. I will be formatting my docs to match this.
Use Web Layout to get a continuous page, set up headings that are more distinctive, and enable the navigation pane. Also include styles for inline code and property name callouts - all in this word template.
Ignition Word Template.zip
Use Notepad ++ with the languages feature and the NPP Export plugin to copy formatted code into the doc. (I also use a centered 8" table, hidden borders, and disabled spell check to make them look nice.)
I've created a language for Notepad++ for Ignition's Expression language. - Maybe someone (@paul-griffith) at IA can get on GitHub and get a complete version into the source. The one below is a work in progress and may change as I use it and find things I missed.
N++ Expression.txt
(change extension to XML and import into Language/User Defined Language/Define your language)