Add custom rosdoc2 config #104

Job	Run time
semi_binary (humble, main) / humble main	1m 46s
semi_binary (iron, main) / iron main	1m 27s
semi_binary (humble, testing) / humble testing	1m 56s
semi_binary (iron, testing) / iron testing	1m 31s
semi_binary (rolling, main) / rolling main	1m 25s
semi_binary (rolling, testing) / rolling testing	1m 47s
	9m 52s

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