BP-2222: Custom installation (initial tech writer review)

[jeff-matthews]

Purpose

This pull request (PR) proposes editorial and style revisions to the new custom installation page written by @Scoubi's in the install branch.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch BP-2222-custom-install-revised

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