docs: docs for next release (#14110)

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

@@ -34,6 +34,8 @@ export const howToTutorialsSidebar = [
         autogenerate_tags: "howTo+admin",
         autogenerate_as_ref: true,
         sort_sidebar: "alphabetize",
+        description:
+          "These how-to guides help you customize the Medusa Admin dashboard with practical examples.",
         children: [
           {
             type: "sidebar",
@@ -60,6 +62,11 @@ export const howToTutorialsSidebar = [
               },
             ],
           },
+          {
+            type: "link",
+            title: "Custom Admin Authentication",
+            path: "/how-to-tutorials/how-to/admin/auth",
+          },
         ],
       },
     ],