docs: add missing configuration pages and remove redundant H1 headers

contents/docs/configuration/payment-shipping/index.mdx

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+---
+title: Payment & Shipping
+description: Configure payment gateways and shipping options for your store.
+---
+
+
+
+WooNooW integrates seamlessly with WooCommerce's native payment and shipping settings while providing a modern interface for managing them.
+
+## Payment Gateways
+
+Navigate to **Settings > Payments** to manage your payment methods.
+
+### Supported Gateways
+WooNooW supports all standard WooCommerce payment gateways, including:
+- **Direct Bank Transfer** (BACS)
+- **Check Payments**
+- **Cash on Delivery**
+- **Stripe** (via official plugin)
+- **PayPal** (via official plugin)
+
+### Configuration
+1. Toggle the **Enabled** switch to activate a gateway.
+2. Click **Manage** (or the gear icon) to configure specific settings like API keys, titles, and descriptions.
+3. Drag and drop gateways to reorder how they appear at checkout.
+
+## Shipping
+
+Navigate to **Settings > Shipping** to configure shipping zones and methods.
+
+### Shipping Zones
+Shipping zones are geographic regions where a certain set of shipping methods and rates apply.
+1. **Add Zone**: Click "Add shipping zone" to create a new region (e.g., "North America", "Europe").
+2. **Region**: Select specific countries or states.
+3. **Methods**: Add methods like "Flat Rate", "Free Shipping", or "Local Pickup".
+
+### Shipping Options
+- **Calculations**: Enable/disable shipping calculator on the cart page.
+- **Destination**: Default to customer billing address or shipping address.
+
+### Shipping Classes
+Use shipping classes to group products of similar type (e.g., "Bulky", "Fragile") to provide different rates.