docs: add docusaurus-plugin-dhub to community integrations

[vrepsys]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.

Motivation

Adds docusaurus-plugin-dhub to the community plugins → Integrations list.

The plugin adds edit links that open a page's source file in the Dhub visual MDX editor, and emits a dhub.json manifest mapping every route to its repo-relative source file (docs including versioned docs, blog posts, and pages). MIT-licensed, published on npm, supports Docusaurus 3.5+ with the classic theme.

Test Plan

Docs-only change — a single entry added to website/community/2-resources.mdx. Ran the website locally and confirmed the entry renders in the Integrations section with working links.

Test links

Deploy preview: https://deploy-preview-12302--docusaurus-2.netlify.app/community/resources#integrations

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