Fix broken star history chart in README

[FaintFlower]

The star history chart shown in the README has been broken, because the underlying GitHub stargazer API restricts how the data can be fetched, leaving the chart blank for visitors.

This change updates the chart to a working alternative so the repository's star history renders correctly again.

No behavior change beyond fixing the chart link and image source.

Summary by CodeRabbit

• Documentation
  • Updated the Star History links and chart image sources in the README.

[github-actions]

PR Validation Results

Change Detection

• ℹ️ No tracked directory changes detected

❌ Required Actions (1)

• [MANDATORY] Check the "Integrity & License" checkbox.

⚠️ Recommendations (3)

• Please select a PR type (Issue, New Feature, Refactor, or Documentation).
• Please provide a meaningful description of your changes.
• Please link a related GitHub issue (Linked Issue: Closes #123).

[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: b73dc9bd-aaac-4331-a296-cb74d47136cd

📥 Commits

Reviewing files that changed from the base of the PR and between 32556d0 and a232b03.

📒 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 Star History link and light/dark chart image URLs now use star-history.dera.page instead of the previous Star History domains.

Changes

Star History links

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

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

Merge Risk: ⚪ Minimal · up to a232b

This localized README link and image-source update has no actionable merge-blocking risk remaining after normal validation checks.

Suggested reviewers: codewithcj

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the problem and solution but omits the required testing, PR type, checklist, and linked issue sections.	Complete the template sections, including test steps, PR type, checklist confirmations, and a linked issue or state that none applies.

✅ 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 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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