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Update docs for `sys` deprecation in 0.94.0
Updates the book for the changes in nushell PR #12747.
This PR deletes the unused book/introduction.md file, so that I don't have to update it. Instead, book/quick_tour.md has the same, but updated, information.
This PR also updates the .sh example files which are shared across the different translations. So, the translations will need to be updated, or I can create new versions of the example files.