docs: move skills to quick start guide

[chenjiahan]

The README should stay focused on the core CLI overview and setup flow.

This PR moves the Skills guidance into both English and Chinese quick start guides with matching anchors, and removes the API imports section from the README.

[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: cdb40b4a-5246-4b1d-bfbb-7d4627923994

📥 Commits

Reviewing files that changed from the base of the PR and between 044c176 and 713a491.

📒 Files selected for processing (3)

• README.md
• website/docs/en/guide/quick-start.mdx
• website/docs/zh/guide/quick-start.mdx

💤 Files with no reviewable changes (1)

• README.md

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📝 Walkthrough

Walkthrough

The README no longer contains the Skills installation guidance or API imports documentation. Equivalent Skills installation instructions for best-practices and migration workflows were added to the English and Chinese quick-start guides.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: moving Skills content into the quick start guide.
Description check	✅ Passed	The description matches the changeset by describing the Skills move and README cleanup.
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
• Commit unit tests in branch chenjiahan/docs-move-skills-to-quick-start

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