removed 'upgrade' as it's not a command anymore in v4#58

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ildella wants to merge 4 commits intodsifford:masterfrom

Commits on May 14, 2024

removed 'upgrade' as it's not a command anymore in v4
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Commits on May 30, 2024

upgrading to 4.x: updated docs, removed old commands, add all first level commands from https://yarnpkg.com/cli/ and the config subcommands as well.
ildella
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upgraded instructions for Linux
ildella
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Commits on Jun 3, 2024

removed up
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