WIP:
* Only a first subset of CSS has been applied
* Look based on Humdinger's and other's work on user guide
* Navigation is still ugly. I need to work around the limitations of Doxygen. Maybe by a patch though.
* Needs a manual extra step: you need to copy the /trunk/docs/userguide/images/logo.png to the /trunk/generated/doxygen/html directory
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29117 a95241bf-73f2-0310-859d-f6bbb57e9c96
