refactor: fold pocketbook in-tree and drop its install steps

Pocketbook is nowhere near ready, so I pulled it back from publication: deleted the github mirror and the cjennings.net repo, removed the server mirror hook, and copied the package into pocketbook/ here until it's ready to spin back out.

Dropped the steps that provisioned it on a fresh install: the gtk4-layer-shell dep and the pip install in archsetup, and the clone in post-install.sh. That clone pointed at the now-deleted github repo, so it would have failed a fresh run regardless. Re-wiring the install is tracked in the pocketbook backlog.

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