docs: split admin widget zone to pages (#10719)

www/apps/resources/app/commerce-modules/user/admin-widget-zones/page.mdx

@@ -0,0 +1,20 @@
+import ProfileContent from "./_content/profile.mdx"
+import UserContent from "./_content/user.mdx"
+
+export const metadata = {
+  title: `User Module's Admin Widget Injection Zones`,
+}
+
+# {metadata.title}
+
+This reference shows all the injection zones in the Medusa Admin related to the User Module.
+
+## Profile Pages
+
+<ProfileContent />
+
+---
+
+## User Pages
+
+<UserContent />