docs: restore star history chart in README

[OctoBored]

The star history section was removed in #409 after the old chart stopped working. This restores it in the same spot using a working chart source, so the badge in the README renders again for people who star the repo.

Summary by CodeRabbit

• Documentation
  • Added a Star History section to the README.
  • Included a GitHub star request and an embedded chart showing star growth.

[vercel]

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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: 39e2675c-14a2-4083-84fe-38581fbf23ce

📥 Commits

Reviewing files that changed from the base of the PR and between 7384649 and f945472.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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Walkthrough

The README now includes a Star History section with a GitHub star request and an embedded Star History chart.

Changes

README Documentation

Layer / File(s)	Summary
Add Star History section README.md	The README adds a GitHub star request and a linked Star History chart.

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

Merge Risk: ⚪ Minimal · up to f9454

This localized README-only change restores the star history chart without any identified merge-blocking risk; it is ready after normal checks and review.

Possibly related PRs

• 1weiho/open-slide#143: Adds the same Star History section and chart to the README.
• 1weiho/open-slide#409: Removes the Star History section that this change re-adds.

Suggested reviewers: 1weiho

Poem

A rabbit found stars in the README bright,
And drew their history into the night.
“Please click one,” said the rabbit with cheer,
“The chart now makes our star trail clear!”
Then it hopped through the markdown with delight.

🚥 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 and concisely describes restoring the star history chart in the README.
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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