docs: reorder sidebar
The amount of GTK3 documentation in the sidebar is obscuring the existence of the GLib and GIO documentation. Re-order the sidebar by dependency, so GLib, GObject, GIO and GTK are ordered reasonably.
The amount of GTK3 documentation in the sidebar is obscuring the existence of the GLib and GIO documentation. Re-order the sidebar by dependency, so GLib, GObject, GIO and GTK are ordered reasonably.