fix: restore broken star history chart in README

[FaintFlower]

The star history chart in the README stopped rendering because the underlying GitHub stargazer API can no longer be used without restrictions.

This PR updates the chart to a working alternative that requires no API token, restoring the chart for visitors and contributors. It only touches the Star History section; all other badges are left unchanged.

No migration needed.

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Summary by cubic

Restores the README Star History chart by switching to a token-free source after API restrictions broke the previous embed. The chart was not rendering; it now renders for visitors and contributors without an API token.

• Replaces api.star-history.com SVG and anchor links with star-history.dera.page.
• Preserves dark/light picture sources and query parameters.
• README-only change; no migration or build/runtime impact.

^{Written for commit 0dd5d16. Summary will update on new commits.}

Summary by CodeRabbit

• Documentation
  • Updated Star History embeds to use the current star-history.dera.page URLs.
  • Replaced legacy Star History and API links in the README.

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[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: dfc1eb5a-7ca4-488f-a275-2893ff77c05b

📥 Commits

Reviewing files that changed from the base of the PR and between bd83535 and 0dd5d16.

📒 Files selected for processing (1)

• README.md

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Walkthrough

The README Star History embed now uses star-history.dera.page for its link and chart image sources. The previous star-history.com and api.star-history.com endpoints were replaced.

Merge Risk: ⚪ Minimal · up to 0dd5d

This localized README-only change restores the star history chart without affecting application behavior or other badges; 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 describes restoring the broken Star History chart, which matches the README URL changes.
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

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