refactor: Migrate documentation content, rebuild UI components, and update core architecture.

docs/hooks/subscriptions.mdx

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+---
+title: Subscription Hooks
+description: Hooks for customizing subscription flows and payments
+date: 2024-01-31
+---
+
+## Filters
+
+### woonoow_pre_process_subscription_payment
+
+Intercept the subscription payment process before it begins.
+
+**Parameters:**
+*   `$result` (null|mixed): Return non-null to short-circuit the process.
+*   `$subscription` (WC_Subscription): The subscription object.
+*   `$order` (WC_Order): The renewal order.
+
+### woonoow_process_subscription_payment
+
+Modify or handle the payment processing via a custom gateway logic.
+
+**Parameters:**
+*   `$result` (null|bool): The result of the payment.
+*   `$gateway` (object): The payment gateway instance.
+*   `$order` (WC_Order): The order being paid.
+*   `$subscription` (WC_Subscription): The subscription object.