move poster PDFS elsewhere too #570

Job	Run time
Ubuntu (Latest), Python (Latest)	1m 19s
Ubuntu 24.04, Python 3.x	1m 19s
Ubuntu (Latest), Python 3 from Apt	1m 15s
Ubuntu 24.04, Python 3.12 from Apt	1m 20s
Ubuntu (Latest), Python (python3-minimal from apt)	58s
	6m 11s

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