Added sidebar link

www/docs/sidebars.js

@@ -225,6 +225,17 @@ module.exports = {
             },
           ],
         },
+        {
+          type: "category",
+          label: "Notifications",
+          items: [
+            {
+              type: "doc",
+              id: "add-plugins/sendgrid",
+              label: "SendGrid",
+            },
+          ],
+        },
         {
           type: "category",
           label: "Payment",