add json-ld metadata

[aelmanaa]

This pull request implements a comprehensive SEO metadata and structured data (JSON-LD) system for documentation pages, enhancing search engine discoverability and supporting advanced features like estimated reading time, difficulty, and publication dates. The changes introduce a new StructuredData component, extend content metadata schemas, and update documentation content to provide richer SEO information.

SEO Structured Data Implementation

• Added the StructuredData.astro component to render Schema.org-compliant JSON-LD structured data for all documentation pages, powered by a new generateStructuredData utility. (src/components/StructuredData.astro, src/components/HeadSEO.astro, [1] [2] [3] [4]
• Updated the HeadSEO.astro component to inject structured data and support both standard metadata and quickstart-specific frontmatter for SEO. (src/components/HeadSEO.astro, [1] [2] [3]
• Updated BaseLayout.astro and QuickstartLayout.astro to pass new metadata and quickstart frontmatter to the SEO component for consistent structured data injection. (src/layouts/BaseLayout.astro, src/layouts/QuickstartLayout.astro, [1] [2]

Metadata Schema Enhancements

• Extended the content metadata schema in content.config.ts to support new fields required for structured data: estimatedTime, difficulty, datePublished, lastModified, version, etc., for both general docs and quickstarts. (src/content.config.ts, [1] [2] [3]

Documentation Content Enrichment

• Updated multiple documentation pages (API references, tutorials, quickstarts, and concepts) to include the new SEO metadata fields, such as excerpt, version, datePublished, lastModified, difficulty, and estimatedTime, ensuring richer and more accurate structured data. (src/content/ccip/api-reference/evm/v1.6.0/*.mdx, src/content/ccip/concepts/architecture/overview.mdx, src/content/ccip/tutorials/evm/transfer-tokens-from-contract.mdx, src/content/quickstarts/ccip-direct-staking.mdx, [1] [2] [3] [4] [5] [6] [7]

Documentation and Guidance

• Added a reference to the new SEO Metadata Guide in the README.md, providing technical writers with instructions for using the new system. (README.md, README.mdR28)

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Name	Status	Preview	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	Aug 7, 2025 0:14am

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