Switch to side-by-side view

--- a/doc/Makefile
+++ b/doc/Makefile
@@ -3,7 +3,8 @@
 .txt.html:
 	asciidoc $<
 
-all: upmpdcli.html scmulti.html release-0.8.html release-0.9.html
+all: upmpdcli.html scmulti.html release-0.8.html release-0.9.html \
+     release-0.11.html
 
 clean:
 	rm -f *.html