While we're at it.. make sure it doesn't pollutes $HOME anymore.
Users will need to either:
- manually move their old ~./.tldr/ files to ~/config/cache/tldr/
(possibly renaming `tldr-main` to just `tldr`),
or
- just remove the old dir, and run `tldl --update` (which takes a
lot of time, and has no progress indication).
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