feat: Add NixOS flakes template for Next.js + Supabase Vercel starter

[ismail-kattakath]

Add Next.js + Supabase Vercel Starter Template

Template Details

• Name: nextjs-supabase
• Description: "Next.js starter template with Supabase integration and one-click Vercel deployment."
• Maintainer: [Your GitHub Username]

Requirements

• Base flake.nix configuration
• Development shell with Node.js, Git
• Next.js + Supabase starter code
• Vercel deployment setup
• Tutorial in README.md covering:
  • Local development with Nix
  • Environment setup
  • Deployment process
  • Common customization patterns

Related Templates

• typescript

Template will help newcomers learn Nix through a practical web development setup.