Sitemap improvemnts and cleanups:

- Avoid nedless tests
- Replace reference to /bin/sed with faster, simpler and probably more correct plan9 sed call.
- Move inline html styling to style.css
- Various code cleanups, bring source style in line with other werc source.

pub/style/style.css

@@ -369,3 +369,6 @@ h1.dir-list-head, ul.dir-list {
     text-transform: capitalize;
     font-weight: bold;
 }
+ul.sitemap-list a {
+    text-transform: capitalize;
+}