* feat(dom): wrap separator with a span
* feat(option,dom): add debug to root class + add duplicate class on subcategory and title
* fix(dom): do not display content wrapper if there is nothing inside
- highlight background CSS rules was wrongly configured
- navbar-header text was black
- active links had a default black background
- fixed a few links using references instead of actual links (doesn't
work once extracted to documentation.md)
- use absolute image path
