feat: restructure docs into store, marketing, builder, and config sections

contents/docs/marketing/coupons.md

@@ -0,0 +1,13 @@
+---
+title: Coupons
+description: Smart discounts and promotions.
+---
+
+# Coupons
+
+Go beyond standard WooCommerce coupons.
+
+## Smart Features
+*   **Auto-Apply**: Apply coupons automatically when cart conditions are met.
+*   **Bulk Generation**: Generate thousands of unique codes for partners.
+*   **URL Coupons**: Create links that automatically apply a discount when clicked.