docs: add missing configuration pages and remove redundant H1 headers

contents/docs/store/customers/index.mdx

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+---
+title: Customers
+description: VIP classification and metrics.
+---
+
+
+
+Know who buys from you.
+
+## Customer Overview
+Navigate to **Store > Customers** to view your customer database. The table provides a quick view of:
+- **Name & Email**: Contact details.
+- **Total Spend**: Lifetime value of the customer.
+- **Orders**: Number of orders placed.
+- **Last Seen**: Date of last activity.
+
+## VIP Classification
+WooNooW automatically tags customers based on their spending habits to help you identify high-value clients.
+
+### Tiers
+- **VIP**: Customers whose total spend exceeds the VIP threshold (configurable in Settings). These are your top 1% or 5% of customers.
+- **Recurring**: Customers who have placed more than one order but haven't reached VIP status yet.
+- **New**: Customers with only a single purchase.
+- **At Risk**: High-value customers who haven't purchased in a long time (e.g., > 90 days).
+
+## Actions
+Click on a customer to view their detailed profile, including:
+- **Order History**: Full list of past purchases.
+- **Notes**: Private admin notes about the customer.
+- **Edit Details**: Update shipping/billing addresses manually.
+
+### Segmentation
+You can use these classifications to segment your [Newsletter](/docs/marketing/newsletter) campaigns. For example, send a special "Thank You" coupon exclusively to your **VIP** segment.