Fix broken star history chart in README

[FaintFlower]

The star history chart in the README is currently broken and renders nothing because the upstream service it relied on has shut down. This PR points it at a working replacement so the chart displays correctly again. No other changes are included.

Summary by CodeRabbit

• Documentation
  • Updated the Star History chart and link to use the new Star History website address.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 4ab74344-0ece-49dc-bcaa-f8ff431311d7

📥 Commits

Reviewing files that changed from the base of the PR and between 793d00a and 754b265.

📒 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 chart and link now use star-history.dera.page instead of the previous Star History domains.

Changes

Star History link update

Layer / File(s)	Summary
Update Star History references README.md	The Star History chart and destination link now use star-history.dera.page.

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

Merge Risk: ⚪ Minimal · up to 754b2

This localized README change restores the star history chart without changing product behavior or runtime code, and no actionable merge-blocking risk remains beyond normal checks and review.

🚥 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 to replace 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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[3rob3]

Nice, thanks!