how to customise gtk-doc output

[jcupitt gmail com]

Hello everyone,

I'd like to customise the gtk-doc output for my project: I'd like a
new header, and some tracker stuff in the footer.

I see glib does this. The online docs here:

https://developer.gnome.org/gobject/unstable/

Have a new header and footer pasted into each page.

What's the best way to do this? Does everyone write a tiny program to
add these new sections, or is there something clever you can do with
xslt and the configure options to gtk-doc?

Thanks!

John