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.

landing/nixpacks.toml

@@ -0,0 +1,11 @@
+[phases.setup]
+nixPkgs = ["nodejs_20", "bun"]
+
+[phases.install]
+cmds = ["bun install"]
+
+[phases.build]
+cmds = ["bun run build"]
+
+[start]
+cmd = "bun run start"