Switch to side-by-side view

--- a/.hgignore
+++ b/.hgignore
@@ -117,3 +117,5 @@
 website/usermanual/*
 website/idxthreads/forkingRecoll.html
 website/idxthreads/xapDocCopyCrash.html
+website/pages/recoll-mingw.html
+website/pages/recoll-windows.html