feat: update organization setting about customer portal (#1009)

Author: dzienisz

platform/projects_and_organizations/organization_settings.mdx

@@ -56,4 +56,23 @@ More information about the plans can be found on the [Pricing](https://tolgee.io
 
 This page shows the list of all invoices for your organization. In addition, you can download the invoices by clicking the **Download** button (if you have a paid plan).
 
-You can visit the Customer portal to update your payment method or subscription information.
+### Changing billing details or payment method
+
+To make payments easier, Tolge partners with Stripe.
+**Customer postal** is where you get redirected to update your **payment method**.
+
+You can see the option to enter **Customer Portal** on the right-hand side of the screen, highlighted in pink.
+
+<ScreenshotWrapper
+  src="/img/docs/platform/Invoices-customer-portal.webp"
+  alt="Screenshot from the Invoices with the view of invoices and Customer Portal button"
+/>
+
+This is your view in the **Customer Portal**:
+
+<ScreenshotWrapper
+  src="/img/docs/platform/customer_portal.webp"
+  alt="Screenshot from redirected stripe website with the view of Payment methods and transaction data"
+/>
+
+Below **Payment method** there is "Add payment method" option, as well below **Transaction Data** you can see "update data" option.