docs: added malchimp integration guide (#12807)

* docs: added malchimp integration guide

* add edit date

www/apps/resources/generated/generated-how-to-tutorials-sidebar.mjs

@@ -463,6 +463,15 @@ const generatedgeneratedHowToTutorialsSidebarSidebar = {
           "description": "Learn how to migrate data from Magento to Medusa.",
           "children": []
         },
+        {
+          "loaded": true,
+          "isPathHref": true,
+          "type": "ref",
+          "title": "Newsletter with Mailchimp",
+          "path": "/integrations/guides/mailchimp",
+          "description": "Learn how to integrate Mailchimp with Medusa to manage and automate newsletters.",
+          "children": []
+        },
         {
           "loaded": true,
           "isPathHref": true,