docs: add loyalty points guide (#12130)

* docs: add loyalty points guide

* remove og

www/apps/resources/sidebars/how-to-tutorials.mjs

@@ -85,6 +85,13 @@ While tutorials show you a specific use case, they also help you understand how
         description:
           "Learn how to use prices from external systems for products.",
       },
+      {
+        type: "link",
+        title: "Loyalty Points System",
+        path: "/how-to-tutorials/tutorials/loyalty-points",
+        description:
+          "Learn how to implement a loyalty points system in your Medusa store.",
+      },
       {
         type: "ref",
         title: "Magento Migration",