Add landing page for voicebox.sh

- Created a new landing page using Next.js 16, featuring a modern design with Tailwind CSS.
- Implemented essential components including Header, Footer, and DownloadSection for user navigation and download options.
- Configured Tailwind CSS and PostCSS for styling, and set up TypeScript for type safety.
- Added a README with setup instructions, project structure, and deployment guidelines.
- Integrated GitHub links for easy access to the repository and releases.
- Established a consistent UI with reusable components and responsive design.

package.json

@@ -5,14 +5,17 @@
   "workspaces": [
     "app",
     "tauri",
-    "web"
+    "web",
+    "landing"
   ],
   "scripts": {
     "dev": "cd tauri && bun run tauri dev",
     "dev:web": "cd web && bun run dev",
+    "dev:landing": "cd landing && bun run dev",
     "dev:server": "source backend/venv/bin/activate && uvicorn backend.main:app --reload --port 8000",
     "build": "cd tauri && bun run tauri build",
     "build:web": "cd web && bun run build",
+    "build:landing": "cd landing && bun run build",
     "generate:api": "./scripts/generate-api.sh",
     "build:server": "./scripts/build-server.sh",
     "lint": "biome lint .",