build a composite guide across repos

Change-Id: I58b33e88f03f07586ccc6250cc790705126c4d0f
diff --git a/docs/Makefile b/docs/Makefile
index a369a94..cc12bb6 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -1,7 +1,17 @@
 default: book
 
 book:
+	ln -s ../platform-install/docs platform-install; \
+	ln -s ../../test/cord-tester/docs test; \
+	ln -s ../../orchestration/xos/docs xos; \
+	ln -s ../../orchestration/profiles profiles; \
 	gitbook init; gitbook serve &
 
 clean:
-	rm -rf _book
+	rm -rf _book; \
+	rm platform-install; \
+	rm test; \
+	rm profiles; \
+	rm xos
+
+