docs: add missing configuration pages and remove redundant H1 headers

contents/docs/marketing/newsletter/index.mdx

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+---
+title: Newsletter
+description: Manage subscribers and send email campaigns directly from your store.
+---
+
+
+
+WooNooW includes a built-in newsletter system, allowing you to build your audience and engage customers without third-party services.
+
+![Newsletter Dashboard](/images/docs/marketing/newsletter-list.png)
+
+## Managing Subscribers
+
+The **Subscribers** tab displays your entire audience list.
+
+*   **Status**: Quickly see if a user is `active` or `unsubscribed`.
+*   **Source**: Identify if the subscriber is a registered WordPress user or a guest.
+*   **Actions**: Use the menu to manually unsubscribe or delete users.
+
+### Collecting Emails
+Subscribers are automatically added via:
+1.  **Checkout Opt-in**: Customers can subscribe while placing an order.
+2.  **[Footer Form](/docs/builder/header-footer#newsletter-integration)**: Use the built-in newsletter block in your store footer.
+3.  **Popups**: (If enabled) Capture emails via exit-intent popups.
+
+## Creating Campaigns
+
+Navigate to the **Campaigns** tab or click **New Campaign** to start composing an email.
+
+![Create Campaign](/images/docs/marketing/campaign-create.png)
+
+### Campaign Settings
+1.  **Title**: Internal name for your reference (e.g., "Holiday Sale 2026").
+2.  **Subject**: The subject line appearing in customers' inboxes. Use emojis to boost open rates! 🎄
+
+### Email Builder
+The visual editor allows you to format your message with rich text, links, and images.
+
+> [!TIP]
+> **Use Variables**
+> Personalize your emails using shortcodes like `{customer_name}` to automatically insert the recipient's first name.
+
+## Sending Process
+Once your campaign is ready, you can:
+*   **Send Test**: Send a preview to your admin email address.
+*   **Schedule**: Pick a future date and time for delivery.
+*   **Send Now**: Immediately blast the campaign to all active subscribers.
+
+WooNooW handles the sending queue in the background to prevent server timeouts.