fix: restore broken star history chart

[FaintFlower]

The star history chart in the README is currently broken: it no longer renders because the underlying service cannot access stargazer data reliably. This PR switches the chart to a service that is working, so the chart displays again. No other changes are included.

Summary by CodeRabbit

• Documentation
  • Updated Star History links and chart images to use the new hosting domain.
  • Preserved support for both light and dark image themes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 163a5165-e24c-4757-9c78-8bf538a9960f

📥 Commits

Reviewing files that changed from the base of the PR and between 584f372 and c12bd14.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan includes up to 4 reviews per rolling hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The README now uses star-history.dera.page for the Star History chart link and light/dark image sources.

Changes

Star History links

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

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

Merge Risk: ⚪ Minimal · up to c12bd

This is a localized README-only change that restores the star history chart using a working service; no actionable merge-blocking risk remains beyond normal checks and review.

Poem

A rabbit hops through links so bright,
Star History points to a newer site.
Light and dark charts safely gleam,
Fresh paths guide each README dream.
Hop, hop—URLs align just right!

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (1 error)

Check name	Status	Explanation	Resolution
Enforce Pr Base	❌ Error	PR #350 targets main: its head parent is origin/main, and FaintFlower authored the commit; no repository evidence identifies FaintFlower as a maintainer.	Retarget the PR to dev, or have an identified maintainer handle the merge to main.

✅ 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 restores 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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