feat: build complete CartSnitch marketing site with landing page, docs, and about

- Landing page with hero section, features, and CTA
- Help center with getting started guide and FAQ
- Privacy policy and terms of service pages
- About page with company mission and values
- Responsive CSS styling for mobile-first experience
- GitHub Actions workflow for automatic deployment
- .gitignore for common files

All content is shopper-focused and emphasizes savings benefits.
Responsive design optimized for mobile grocery shopping context.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitignore

@@ -0,0 +1,19 @@
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Build
+dist/
+build/
+node_modules/
+
+# Environment
+.env
+.env.local