doc: group the "related pages" by general topic

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

doc/Makefile.am

@@ -17,11 +17,13 @@ header_files = \
 	$(srcdir)/gestures.dox \
 	$(srcdir)/normalization-of-relative-motion.dox \
 	$(srcdir)/palm-detection.dox \
+	$(srcdir)/page-hierarchy.dox \
 	$(srcdir)/scrolling.dox \
 	$(srcdir)/seats.dox \
 	$(srcdir)/t440-support.dox \
 	$(srcdir)/tapping.dox \
-	$(srcdir)/test-suite.dox
+	$(srcdir)/test-suite.dox \
+	$(srcdir)/tools.dox
 
 diagram_files = \
 	$(srcdir)/dot/seats-sketch.gv \

doc/page-hierarchy.dox

@@ -0,0 +1,32 @@
+/**
+@page touchpads Touchpads
+
+- @subpage scrolling
+- @subpage clickpad_softbuttons
+- @subpage tapping
+- @subpage gestures
+- @subpage palm_detection
+- @subpage t440_support
+
+@page touchscreens Touchscreens
+
+- @subpage absolute_axes
+
+@page pointers Mice, Trackballs, etc.
+
+- @subpage motion_normalization
+
+@page general General setup
+
+- @subpage udev_config
+- @subpage seats
+
+@page misc Users
+
+- @subpage faq
+
+@page developers Developers
+
+- @subpage test-suite
+
+*/