chore: sitemap paths added into the robots.txt

[canerakdas]

Description

Since we now have multiple sitemap files, the sitemap paths have been added to robots.txt for the SEO.

Validation

In preview environment the robots.txt should contains

Sitemap: https://nodejs.org/sitemap.xml
Sitemap: https://nodejs.org/learn/sitemap.xml

Related Issues

Related with this comment; nodejs/learn#47 (review)

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

[cursor]

PR Summary

Low Risk
Low risk: adds static sitemap declarations to robots.txt without changing crawling rules or any runtime logic.

Overview
Updates the generated robots.txt metadata to include multiple sitemap entries, adding both ${BASE_URL}/sitemap.xml and ${BASE_URL}/learn/sitemap.xml so search engines can discover all sitemap files.

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[github-actions]

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/nodejs-website

Please review the changes when you have a chance. Thank you! 🙏

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Apr 14, 2026 2:53pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.25%. Comparing base (69cc705) to head (1f801d9).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8820      +/-   ##
==========================================
- Coverage   74.27%   74.25%   -0.03%     
==========================================
  Files         104      104              
  Lines        8847     8847              
  Branches      328      328              
==========================================
- Hits         6571     6569       -2     
- Misses       2274     2276       +2     
  Partials        2        2              

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[Copilot]

Pull request overview

Adds sitemap references to the dynamically generated robots.txt so crawlers can discover multiple sitemap files.

Changes:

• Import BASE_URL for constructing absolute sitemap URLs.
• Add two sitemap entries (/sitemap.xml and /learn/sitemap.xml) to the MetadataRoute.Robots output.

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