docs: fix Overview component style

[9aoy]

Summary

Fix the Overview component style after updating to Rspress v2.0.0-beta.33.

Related Links

https://github.com/web-infra-dev/rspress/releases/tag/v2.0.0-beta.33

Checklist

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

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[Copilot]

Pull Request Overview

This PR updates the Overview component styling to maintain visual consistency after upgrading to Rspress v2.0.0-beta.33. The changes replace semantic <h2> elements with styled <div> elements and refactor the accompanying CSS to use a dedicated .title class.

Key Changes:

• Replaced <h2> tags with <div className={styles.title}> in Overview and BuildOverview components
• Introduced a new .title CSS class with explicit styling previously applied to h2 elements
• Updated spacing, colors, and media query breakpoints to align with Rspress v2 design system

Reviewed Changes

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

File	Description
website/theme/components/ConfigOverview.tsx	Replaced <h2> elements with styled <div> elements using the new .title class
website/theme/components/ConfigOverview.module.scss	Added .title class, updated spacing/colors, and adjusted media query breakpoints

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