fix: broken star history chart in readme

[Dessalines39394]

The star history chart in our readme is broken, so this change points it to a working mirror that does not rely on the api subdomain anymore. We are switching to it because the current star history chart is broken due to GitHub stargazer API restrictions.

Summary by CodeRabbit

• Documentation
  • Updated the Star History badge to use the new Star History service and link.

[CLAassistant]

All committers have signed the CLA.

[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: eb826508-4f45-4b3c-a0d4-f28bd1dd1fe7

📥 Commits

Reviewing files that changed from the base of the PR and between f72310c and 8898f27.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review.

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📝 Walkthrough

Walkthrough

The README.md Star History badge now uses the star-history.dera.page service for its image and link.

Changes

Star History Badge

Layer / File(s)	Summary
Update Star History badge reference README.md	The Star History badge image and link now use star-history.dera.page.

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

Merge Risk: ⚪ Minimal · up to 8898f

This change only replaces the README star-history chart link and does not affect product code or runtime behavior; no actionable merge-blocking risk remains beyond normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README change that fixes the broken Star History chart.
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

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