docs: fix the broken star history chart

[FaintFlower]

The star history chart in the README is currently broken due to GitHub stargazer API restrictions. This updates the chart links to a working alternative so the project's growth is visible again.

Summary by CodeRabbit

• Documentation
  • Updated the Star History badge and link in the README to use the new Star History domain.

[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: 50bad416-f93e-4e5c-8ac2-166757380b71

📥 Commits

Reviewing files that changed from the base of the PR and between 7af8f6e and 2679944.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README Star History image and hyperlink now use star-history.dera.page. The repository and Date parameters remain unchanged.

Changes

Star History reference

Layer / File(s)	Summary
Update Star History URLs README.md	The Star History image source and hyperlink now use the star-history.dera.page domain. The repository and Date parameters remain unchanged.

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

Merge Risk: ⚪ Minimal · up to 26799

This is a localized README-only link update with no actionable merge-blocking risk remaining after normal checks and review.

Suggested reviewers: yyiilluu, guangyu-reflexio, yilu331

🚥 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 describes the README change that fixes the broken Star History chart link.
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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