chore(download): remove dead page

[avivkeller]

There are no backlinks to this page, and thus, it should be fine to delete.

[vercel]

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Project	Deployment	Preview	Updated (UTC)
nodejs-org	Ready	Preview	Sep 22, 2025 6:00pm

[Copilot]

Pull Request Overview

This PR removes a dead documentation page that provides installation instructions for Node.js via various package managers. The page had no backlinks, making it safe to delete as part of code cleanup.

• Removes the entire package manager installation guide file
• Eliminates unused documentation content
• Cleans up the codebase by removing orphaned files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.56%. Comparing base (5140729) to head (3bceadd).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8174      +/-   ##
==========================================
- Coverage   76.58%   76.56%   -0.03%     
==========================================
  Files         115      115              
  Lines        9602     9602              
  Branches      322      323       +1     
==========================================
- Hits         7354     7352       -2     
- Misses       2247     2249       +2     
  Partials        1        1              

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[mikeesto]

We had a PR 3 weeks ago (#8114), so it seems like some folks are finding this page?

[avivkeller]

You can find the page via google search with specific terms, but it'll rarely show up since there are zero backlinks to this page. Thus, I think, it has little value.