Use a (software) environment manager#8

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nick-ulle wants to merge 4 commits intomainfrom

nu-environment-management

Commits on Oct 7, 2025

Move Environment Management to Ch4.
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Commits on Oct 15, 2025

Update computing environments intro and section 1.
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Commits on Oct 16, 2025

Add draft text about containerization.
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Commits on Oct 22, 2025

Add draft text about cloud computing.
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