Fixup headers, maintainers, README, before public release #48

Job	Run time
determine-distros	4s
Generate Debian packages for ROS2 kilted	8m 46s
Generate Debian packages for ROS2 iron	7m 45s
Generate Debian packages for ROS2 humble	8m 32s
Generate Debian packages for ROS2 jazzy	8m 30s
Generate Debian packages for ROS2 rolling	9m 28s
Smoke test ROS2 humble	1m 10s
Smoke test ROS2 kilted	1m 18s
Smoke test ROS2 jazzy	1m 17s
Smoke test ROS2 iron	1m 12s
Smoke test ROS2 rolling	1m 15s
	49m 17s

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