docs: add missing configuration pages and remove redundant H1 headers

contents/docs/configuration/modules/index.mdx

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+---
+title: Modules
+description: Enable or disable specific WooNooW features to optimize performance.
+---
+
+
+
+WooNooW is built with a modular architecture. You can enable or disable specific features based on your needs to keep your admin interface clean and your site performant.
+
+Navigate to **Settings > Modules** to manage these components.
+
+## Available Modules
+
+### Marketing
+- **Newsletter**: Built-in email marketing suite. Manage subscribers and send campaigns.
+- **Wishlist**: Allow customers to save products for later. Adds wishlist icons to product grids.
+- **Social Proof**: (Coming Soon) Show recent sales notifications.
+
+### Store Management
+- **Subscriptions**: Enable recurring payments and subscription products.
+- **Pre-Orders**: Allow customers to order products before they are available.
+
+### Developer
+- **Custom CSS/JS**: Inject custom code without editing theme files.
+- **Beta Features**: Early access to experimental features (use with caution).
+
+## How to Enable/Disable
+1. Find the module card in the list.
+2. Toggle the switch to **On** or **Off**.
+3. Changes usually take effect immediately, but some modules may require a page refresh or menu rebuild.