docs: add docusaurus-plugin-structured-data

[CoffeeCupTechWriting]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Add my plugin that automatically generates JSON-LD structured data (schema.org) for your documentation site's SEO.

npm : https://www.npmjs.com/package/@coffeecup_tech/docusaurus-plugin-structured-data

Test Plan

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

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