Create the HTML navigation page.
The function gathers the real content of the chapters’ navigation pages, extracts real TOC portions and puts together all of them as one large TOC structure. The result is added to a textual HTML template.
Note that the links to the real content must be modified on the fly, because the original chapters are all put into a separate subdirectory.
the full book data
Collection Navigation page
Creation of a collection navigation page. See create_nav_page for details