docs: polish quick start and environment wording

[chenjiahan]

Summary

• refine quick start wording for clarity around examples, setup prompts, and non-interactive usage
• clarify multi-environment build overview and plugin guidance

Testing

• pnpm lint

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[Copilot]

Pull request overview

This PR refines documentation wording to improve clarity and readability across the quick start guide and environment build documentation. The changes make instructions more explicit and explanations more concise while maintaining technical accuracy.

Key changes:

• Clarified setup instructions and non-interactive mode usage in the quick start guide
• Simplified multi-environment build overview and plugin customization guidance

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/docs/en/guide/start/quick-start.mdx	Improved clarity of setup prompts, optional tools selection instructions, and non-interactive mode description
website/docs/en/guide/advanced/environments.mdx	Simplified multi-environment build introduction and plugin customization explanation

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