Update cnxarchive to_html tests following updates in rhaptos.cnxmlutils

- Remove classes like "para" for <p>, "list" for <ul> and "item" for
  <li>
- Change class to data-type, e.g. <span class="media"> to <span
  data-type="media">
- Change data-type to data-label
Add slugified title to urls in sitemap.xml

Also change routing a bit to allow title in contents urls