docs(quick-start): add deno initialization command

[chenjiahan]

Summary

Added the Deno initialization command (deno init --npm rsbuild@latest) to the package manager options in the quick start guide.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds Deno command support to the quick start documentation, enabling users to initialize Rsbuild projects using Deno as their JavaScript runtime alongside npm, yarn, pnpm, and bun.

• Added deno: 'deno init --npm rsbuild@latest' to the package manager options in both English and Chinese documentation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
website/docs/en/guide/start/quick-start.mdx	Added Deno initialization command to the English quick start guide
website/docs/zh/guide/start/quick-start.mdx	Added Deno initialization command to the Chinese quick start guide

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