docs: fix broken star history chart

[PingouinFerreux]

The star history chart in the README is currently broken because the upstream provider stopped working due to GitHub stargazer API restrictions. Point it at a working chart so the badge renders again.

Summary by CodeRabbit

• Documentation
  • Updated the Star History chart and links to use the new star-history.dera.page destination.

[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: 49cbaf63-15e8-4242-944f-4f470e508e65

📥 Commits

Reviewing files that changed from the base of the PR and between 15db001 and 3ee322e.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md Star History chart now uses star-history.dera.page for its image and destination link.

Changes

Star History links

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

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

Suggested reviewers: carlfriedrich, sandr01d

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the chart fix but omits the checklist, change type, and test environment sections required by the template.	Complete the checklist, select the change type, and document the shell and operating system test environments.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the README star history chart fix.
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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[carlfriedrich]

@PingouinFerreux Thanks for your contribution. Seems legit. Will wait for approval of other maintainer.