docs: add LINUX DO link to readmes

[bjcdeshu]

Summary

• add a low-key LINUX DO link to the existing navigation row in both READMEs
• leave code, assets, and product copy unchanged

Verification

• git diff --check
• link appears exactly once in each README

Summary by CodeRabbit

• Documentation
  • Added a LINUX DO project link to the download and release information in the English and Simplified Chinese README files.
  • Existing release, Android compatibility, feedback, and bug-report links remain unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3b17dee5-66ae-4452-913f-a5b4e27f0c52

📥 Commits

Reviewing files that changed from the base of the PR and between 6ab8bf3 and ef2d4b1.

📒 Files selected for processing (2)

• README.md
• README.zh-CN.md

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📝 Walkthrough

Walkthrough

The English and Chinese README download lines now include an additional LINUX DO link while retaining the existing release, Android support, feedback, and bug-report links.

Changes

README download links

Layer / File(s)	Summary
Add LINUX DO download link README.md, README.zh-CN.md	The download information lines add a LINUX DO link in both README languages without changing the existing links.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• bjcdeshu/mora-markdown#17: Updates overlapping README download-area links.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately states the main change: adding a LINUX DO link to the READMEs.
Description check	✅ Passed	It includes a clear summary and verification steps, though it doesn't follow the template's Why and Screenshots sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch iris/readme-linuxdo-link

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