Make the license more prominant. Remove include from drm-intel.rst.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>