Switch to side-by-side view

--- a/website/pages/Makefile
+++ b/website/pages/Makefile
@@ -3,7 +3,7 @@
 .txt.html:
 	asciidoc $<
 
-all: recoll-mingw.html
+all: recoll-mingw.html recoll-windows.html
 
 clean:
 	rm -f *.html