feat: Add comprehensive SEO metadata to documentation

[zechengz]

Description

Add SEO metatags to docs.json including (more details in https://www.mintlify.com/docs/optimize/seo):

• Standard HTML meta tags (description, keywords, robots)
• Open Graph tags for social sharing
• Twitter Card metadata
• Mobile optimization tags
• Article metadata for better indexing

Fix the notion example

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• I have read the CONTRIBUTION guide (required)
• I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #issue-number in the PR description (required)
• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed:
• I have added examples if this is a new feature

If you are unsure about any of these, don't hesitate to ask. We are here to help!

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-seo-metadata

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[Wendong-Fan]

thanks @zechengz !