docs: improve clarity in documentation files

[Copilot]

Improved English readability in documentation translated from Chinese. Changes focus on removing awkward phrasing and making the tone more direct and professional.

Changes by file

guide/advanced/env-vars.mdx

• Fixed typo: "during during the build" → "during the build"
• Technical term accuracy: "invalid code" → "dead code"

guide/basic/static-assets.mdx

• Removed excessive "please" usage for more professional tone
• Simplified sentence structure in public folder usage notes

guide/optimization/build-performance.mdx

• Clarified: "at dev startup" → "during dev server startup"

guide/basic/server.mdx

• Improved consistency: "the HTML page" → "HTML pages" where contextually appropriate
• Condensed comparison descriptions

guide/optimization/optimize-bundle.mdx

• Removed verbose phrases: "of online users", "we will introduce"
• Made instructions more direct: "We can eliminate" → "You can eliminate"
• Simplified technical explanations for image compression and chunk splitting

All changes preserve original meaning and technical accuracy while improving readability for non-native English speakers.

Original prompt

Improve the English docs in website/docs/en. Many paragraphs were
translated from Chinese and may sound unnatural.

  Rewrite sentences that don't read like authentic, professional English —
  **without changing their meaning** — so they match the tone of
  high-quality open-source docs.


  - **IMPORTANT:** Only change a sentence if it clearly improves clarity or
  correctness.

  - **IMPORTANT:** Don't alter the original meaning.

  - If you edit files in `docs/en`, check the same files in `docs/zh` to see
  if similar updates are needed.

  - Use clear, simple language for non-native English readers.

  - Keep reasonable technical abbreviations (e.g., `dev server`).

  - Use sentence case for Markdown headings.

  - Don't change more than 5 files in one PR.

  - Start PR titles with `docs:`.

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[Copilot]

Pull Request Overview

This PR improves the clarity and professionalism of English documentation that was originally translated from Chinese. The changes remove awkward phrasing, excessive politeness markers, and verbose constructions while maintaining technical accuracy.

Key changes:

• Corrected technical terminology (e.g., "invalid code" → "dead code")
• Removed unnecessary phrases ("of online users", "we will introduce")
• Fixed typos and improved sentence flow

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
guide/advanced/env-vars.mdx	Fixed duplicate word typo and corrected technical term to "dead code"
guide/basic/static-assets.mdx	Removed excessive "please" usage and simplified sentence structures
guide/optimization/build-performance.mdx	Clarified timing reference for lazy compilation
guide/basic/server.mdx	Improved consistency in terminology and condensed comparison text
guide/optimization/optimize-bundle.mdx	Removed verbose phrases and made instructions more direct

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