Previously the 'book.css' file was applied as the sole stylesheet for the
Doxygen generated documentation. This stylesheet now applies it as a secondary
stylesheet to override Doxygen's defaults. The main advantage is that when
Doxygen adds new features, they will now be styled by default.
I did my best to clean up the book.css file, though it is not unlikely that
there still is a lot of duplicate CSS. For now though, the output looks mostly
the same, the code blocks no longer have an empty line between each of the lines
and the tooltip text - while not working - are no longer visible on the bottom
of the page.
Change-Id: Ia50915245ecd981843d0d8ec42e362b538187920
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3269
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
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