Refactor documentation structure and dependencies for migration to Fumadocs

- Updated `.gitignore` to include new build and generated content directories.
- Removed outdated Mintlify configuration files and documentation.
- Introduced new `MIGRATION.md` to outline the transition from Mintlify to Fumadocs.
- Added `mdx-components.tsx` for MDX component configuration and compatibility.
- Updated `package.json` and `next.config.mjs` for new dependencies and Next.js configuration.
- Created `source.config.ts` for content source configuration.
- Added OpenAPI specification in `openapi.json` for API documentation.
- Removed legacy files and adjusted project structure to align with Fumadocs conventions.

docs/MIGRATION.md

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+# Documentation Migration: Mintlify → Fumadocs
+
+This document summarizes the migration of documentation from `/docs` (Mintlify) to `/docs2` (Fumadocs).
+
+## What Was Done
+
+### 1. Files Copied
+- ✅ All 29 MDX files from `/docs` folders (overview, api, developer, plans)
+- ✅ All 4 root-level markdown files (AUTOUPDATER.md, AUTOUPDATER_QUICKSTART.md, TROUBLESHOOTING.md, README.md)
+- ✅ All images (3 webp files) → `public/images/`
+- ✅ All logo files (2 png files) → `public/logo/`
+
+### 2. Component Migration
+Created compatibility layer in `components/mintlify-compat.tsx` that maps Mintlify components to Fumadocs equivalents:
+
+- `<Frame>` → Simple div wrapper (images are zoomable by default in Fumadocs)
+- `<CardGroup>` → `<Cards>` (Fumadocs component)
+- `<Card>` → `<Card>` (with icon string → Lucide icon mapping)
+- `<Steps>` / `<Step>` → Direct mapping to Fumadocs components
+- `<Tip>`, `<Note>`, `<Info>` → `<Callout type="info">`
+- `<Warning>` → `<Callout type="warn">`
+- `<Danger>` → `<Callout type="error">`
+- `<AccordionGroup>` / `<Accordion>` → HTML `<details>` / `<summary>` elements
+
+### 3. Navigation Structure
+Created `meta.json` files for each folder:
+- `content/docs/meta.json` - Root documentation
+- `content/docs/overview/meta.json` - Overview pages
+- `content/docs/api/meta.json` - API reference
+- `content/docs/developer/meta.json` - Developer docs
+- `content/docs/plans/meta.json` - Plans/roadmap
+
+### 4. Link Fixes
+- Fixed incorrect `/guides/...` paths → `/overview/...`
+- All internal links now use correct paths
+
+### 5. Branding
+- Updated `lib/layout.shared.tsx` to use "Voicebox" as the nav title
+
+## File Structure
+
+```
+docs2/
+├── components/
+│   └── mintlify-compat.tsx    # Mintlify → Fumadocs component mappings
+├── content/docs/
+│   ├── meta.json              # Root navigation
+│   ├── overview/              # 12 MDX files
+│   ├── api/                   # 5 MDX files
+│   ├── developer/             # 12 MDX files
+│   ├── plans/                 # 4 MD files
+│   └── *.md                   # 4 root markdown files
+├── public/
+│   ├── images/                # 3 webp files
+│   └── logo/                  # 2 png files
+└── mdx-components.tsx         # MDX component configuration
+```
+
+## Icon Mapping
+
+The following icon strings are mapped to Lucide icons:
+- `microphone` → Mic
+- `film` → Film
+- `code` → Code
+- `shield` → Shield
+- `download` → Download
+- `rocket` → Rocket
+- `apple` → Apple
+- `windows` → Windows
+- `server` → Server
+- `user` → User
+- `waveform` → Waveform
+
+## Next Steps
+
+1. **Test the build**: Run `npm run build` (requires Node.js >= 20.9.0)
+2. **Start dev server**: Run `npm run dev` to preview
+3. **Customize styling**: Update `app/global.css` if needed
+4. **Add more icons**: Extend `iconMap` in `mintlify-compat.tsx` as needed
+5. **Review navigation**: Adjust `meta.json` files to customize page order
+
+## Notes
+
+- Image paths (`/images/...`) work as-is since Next.js serves from `public/`
+- All Mintlify components are now compatible with Fumadocs
+- Navigation structure follows Fumadocs conventions
+- No breaking changes to content - all MDX files work with compatibility layer