In our ongoing quest to move away from configuration.nix, this commit moves printing over to redhead (which to-my-knowledge is the only machine we want to print on). To store printer configurations (and be useful in the first place) redhead needs the CUPS directory persisted, so let's do that...
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packetmix/systems/personal/configuration.nix
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packetmix/systems/personal/configuration.nix
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packetmix/systems/redhead/printing.nix
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packetmix/systems/redhead/printing.nix
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