paper: don't keep the menu affixed to the top

This makes scrolling slow and causes browsers to use a lot of CPU time.

templates/static/style-paper.css

@@ -29,17 +29,12 b' body {'
   margin: 0;
   font-size: 80%;
   text-align: left;
-  position: fixed;
+  position: absolute;
   top: 20px;
   left: 20px;
   right: auto;
 }
 
-#.menu {
-  position: absolute !important;
-  top:expression(eval(document.body.scrollTop + 27));
-}
-
 .menu ul {
   list-style: none;
   padding: 0;