docs: added first-purchase promotion guide (#12828)

www/apps/resources/app/infrastructure-modules/notification/page.mdx

@@ -86,8 +86,41 @@ Medusa provides other Notification Modules that actually send notifications, suc
         variant: "green",
         children: "For Production"
       }
+    },
+    {
+      title: "Mailchimp",
+      href: "/integrations/guides/mailchimp",
+      badge: {
+        variant: "blue",
+        children: "Tutorial",
+      }
+    },
+    {
+      title: "Resend",
+      href: "/integrations/guides/resend",
+      badge: {
+        variant: "blue",
+        children: "Tutorial",
+      }
+    },
+    {
+      title: "Slack",
+      href: "/integrations/guides/slack",
+      badge: {
+        variant: "blue",
+        children: "Tutorial",
+      }
+    },
+    {
+      title: "Twilio SMS",
+      href: "/how-to-tutorials/tutorials/phone-auth#step-3-integrate-twilio-sms",
+      badge: {
+        variant: "blue",
+        children: "Tutorial",
+      }
     }
   ]}
+  itemsPerRow={2}
 />
 
 ---