This perl script outputs all the built-in help as 1 flat HTML file, as well as several of the files in the docs directory.
Simply place it in your WebGUI/sbin directory and call it from there.
perl flatHelp.pl --configFile=WebGUI.conf
I've recently added a feature so that you can specify different languages, this is as of yet untested.
perl flatHelp.pl --configFile=WebGUI.conf --language=MyLanguage