docs: complete doc command guide

[chenjiahan]

This PR completes the bilingual rs doc command guide so users can understand the Rspress-backed documentation workflow.

It documents setup, usage examples, supported subcommands, and configuration, with links to the relevant Rspress references. The English and Chinese pages remain aligned, including matching heading anchors and PackageManagerTabs installation commands.

[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: b4fd071a-f46d-4ee3-8586-e6cfef8e8a36

📥 Commits

Reviewing files that changed from the base of the PR and between 162206e and 05a4739.

📒 Files selected for processing (2)

• website/docs/en/guide/cli/doc.mdx
• website/docs/zh/guide/cli/doc.mdx

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📝 Walkthrough

Walkthrough

Expanded the English and Chinese rs doc CLI documentation pages. The pages now cover installation of @rspress/core, command usage, options, examples, the build, preview, and eject subcommands, and configuration through define.doc() in rstack.config.ts.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: completing the rs doc command guide.
Description check	✅ Passed	The description matches the documented bilingual rs doc guide updates, including setup, usage, subcommands, and configuration.
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-doc-command

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