docs: improve SEO titles and descriptions across MDX pages

[mintlify]

Summary

Adds unique, descriptive title and description frontmatter across the documentation to improve search snippets and discoverability.

Changes

• Added description frontmatter to ~490 pages that were missing one, each tailored to the page's content and 130–160 characters.
• Shortened 17 page titles that exceeded 60 characters (search snippets truncate longer titles).
• Rewrote 46 descriptions that were under 130 characters and 6 that exceeded 160 characters.
• Fixed one page (integrating-ed25519-accounts-...) whose frontmatter title was broken across multiple lines.
• Ensured every description is unique across the corpus.
• No OpenAPI spec pages were found, so no spec-driven exceptions applied.

Validation

• mint validate — passes
• mint broken-links — no broken links

[mintlify]

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Project	Status	Preview	Updated (UTC)
hedera-docs	🟢 Ready	View Preview	May 27, 2026, 6:51 PM