New year, new copyright, new expected unknown issues with various files
that won't be covered by the script and/or will be but shouldn't change.
I'll do the details on Jan 1, but would appreciate this being
preapproved so I can actually get it merged by then.
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This disables the PDF docs builds on MacOS on CI (they are still built
locally by default) and removes them from the Nix closure by
introducing a separate ci-cached attribute that filters out texlive.
Since we built `nix-build nix -A tools -A cached` on CI, I’ve also
removed all the Tex stuff from tools which only means that it ends up
in PATH which nobody seems to care about.
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