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>

.github/workflows/deploy.yml

@@ -0,0 +1,40 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+      
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: '.'
+      
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4