Add initial setup for Fumadocs documentation migration

- Created new directory structure for documentation under `/docs2`.
- Added `.gitignore` to exclude build artifacts and dependencies.
- Introduced `package.json`, `next.config.mjs`, and `postcss.config.mjs` for project configuration.
- Implemented MDX components in `mdx-components.tsx` for rendering documentation.
- Migrated existing documentation content and created new files for auto-updater and other features.
- Established compatibility layer for Mintlify components in `mintlify-compat.tsx`.
- Set up OpenAPI documentation in `openapi.json`.
- Updated README and migration guide to reflect new structure and usage instructions.
- Ensured all components and pages are ready for development and deployment with Fumadocs.

docs2/content/docs/api/authentication.mdx

@@ -0,0 +1,55 @@
+---
+title: "Authentication"
+description: "API authentication and security"
+---
+
+## Current Status
+
+<Warning>
+  Authentication is not currently implemented in Voicebox. The API is intended for local use only.
+</Warning>
+
+## Local Usage
+
+For local development and usage:
+- API runs on `localhost:17493`
+- No authentication required
+- Access restricted to local machine
+
+## Future Implementation
+
+Authentication will be added in a future release for:
+- Remote deployments
+- Multi-user access
+- Production environments
+
+Planned authentication methods:
+- API keys
+- OAuth 2.0
+- JWT tokens
+
+## Security Best Practices
+
+Until authentication is implemented:
+
+<CardGroup cols={2}>
+  <Card title="Use VPN" icon="shield">
+    Use WireGuard or Tailscale for remote access
+  </Card>
+  <Card title="Reverse Proxy" icon="server">
+    Run behind nginx with basic auth
+  </Card>
+  <Card title="Firewall" icon="fire">
+    Restrict access to trusted IPs only
+  </Card>
+  <Card title="Local Only" icon="laptop">
+    Don't expose to public internet
+  </Card>
+</CardGroup>
+
+## Coming Soon
+
+- API key management
+- User accounts
+- Rate limiting
+- Access control