[Docs Site] Add frontmatter to index.md output

[KianNH]

Summary

Add frontmatter to index.md output

Screenshots (optional)

[github-actions]

Preview URL: https://5e2c091d.preview.developers.cloudflare.com
Preview Branch URL: https://kian-pcx-16835.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/style-guide/fixtures/markdown/	https://kian-pcx-16835.preview.developers.cloudflare.com/style-guide/fixtures/markdown/

[kodster28]

Seems like this broke the test + has some merge conflicts?

[hyperlint-ai]

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PR Change Summary

Added frontmatter to the index.md output to enhance metadata management.

• Introduced 'lastUpdated' field in the frontmatter of index.md
• Updated the metadata structure for better documentation organization

Modified Files

• src/content/docs/style-guide/fixtures/markdown.mdx

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