Migrate to clean package-only structure

- Simplified flake.nix to focus only on packaging Cursor
- Removed system configuration files (archived locally)
- Updated to clean, reusable flake structure
- Added simple update-cursor.sh script
- Updated documentation for new structure

This migration  makes the flake purely focused on providing the Cursor package.

.gitignore

@@ -0,0 +1,86 @@
+# NixOS
+result
+result-*
+
+# Nix store
+/nix/store/
+
+# VM disk images (generated during testing)
+*.qcow2
+*.raw
+*.vmdk
+*.vdi
+
+# Temporary files from VM testing
+/tmp/nix-vm.*/
+
+# Temporary files
+*.tmp
+*.temp
+*.swp
+*.swo
+*~
+
+# Logs
+*.log
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# IDE files
+.vscode/
+.idea/
+*.sublime-project
+*.sublime-workspace
+
+# Build artifacts
+dist/
+build/
+*.o
+*.so
+*.dylib
+*.dll
+
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Rust
+target/
+Cargo.lock
+
+# Git
+.git/
+.gitignore
+
+# Backup files
+*.bak
+*.backup
+*.old
+
+# Local configuration
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local archive-old-system-configs/