Add the doxygen-awesome files to the libcamera repository to improve the styling of the doxygen documentation. These are from commit 46f0661d13206b0f837784426580c5470ec6d1b7 Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Date: Thu Sep 11 21:32:39 2025 +0300 Documentation: doxygen-awesome-css: Switch license information to SPDX of https://github.com/jothepro/doxygen-awesome-css. Only the files needed by libcamera are imported. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>