Add Dhub to headless CMS directory

src/site/headless-cms/dhub.md

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+---
+title: Dhub
+homepage: https://dhub.dev
+twitter: withdhub
+opensource: "No"
+typeofcms: "Git-based"
+supportedgenerators:
+  - Docusaurus
+  - Next.js
+  - Astro
+description: Git-based CMS for documentation sites. Notion-style visual Markdown and MDX editor with two-way GitHub sync. Your content stays in your repo as clean Markdown — no lock-in.
+---
+
+Dhub is a Git-based CMS built for documentation websites. It gives content writers a Notion-style visual editor for Markdown and MDX while keeping all content stored in your GitHub repository.
+
+## Why Dhub?
+
+- **Visual editing**: A WYSIWYG editor that handles Markdown tables, images, LaTeX equations, callouts, and custom MDX components — no raw Markdown required.
+- **Two-way GitHub sync**: Push changes directly to your main branch or submit them as a Pull Request. Edits made via Git/VS Code show up in Dhub immediately.
+- **No lock-in**: Everything is committed back to GitHub as clean Markdown or MDX. Stop using Dhub anytime and keep all your files.
+- **Team collaboration**: Non-technical contributors can write and manage docs without needing a GitHub account or knowing Git.
+
+## Framework Support
+
+- **Docusaurus**: Native support — import your existing project from GitHub and start editing.
+- **Next.js & React**: Integrates with [Prose UI](https://prose-ui.com), an open-source component library for rendering Markdown content.
+- **General Markdown**: Works with any static site generator that uses `.md` or `.mdx` files.