fix: remove unused Alert import that breaks build

Author: thomasgauvin

src/content/docs/email-service/concepts/email-lifecycle.mdx

@@ -7,7 +7,7 @@ sidebar:
   order: 2
 ---
 
-import { Tabs, TabItem, Alert } from "~/components";
+import { Tabs, TabItem } from "~/components";
 
 The email lifecycle describes the complete journey of an email from the initial send request through final delivery status. Understanding this process helps you optimize your email implementation and troubleshoot delivery issues.