docs(meta): add open graph tags example

[chenjiahan]

Summary

Add documentation examples for Open Graph meta tags and improve the organization of the charset tag section in documentation files.

Checklist

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

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[Copilot]

Pull Request Overview

This PR enhances the documentation for HTML meta tags configuration by adding Open Graph examples and improving the organization of the charset section.

Key changes:

• Added comprehensive Open Graph meta tags examples with proper property attribute usage
• Reorganized charset documentation into a dedicated subsection with clearer headings
• Simplified descriptive text by removing redundant qualifiers (e.g., "最终" / "final")

Reviewed Changes

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

File	Description
website/docs/zh/config/html/meta.mdx	Adds Open Graph examples and restructures charset section with improved Chinese documentation
website/docs/en/config/html/meta.mdx	Adds Open Graph examples and restructures charset section with improved English documentation

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