chore: moves collections folders property to the top level (#12508)

docs/folders/overview.mdx

@@ -1,6 +1,6 @@
 ---
 title: Folders
-label: Folders
+label: Overview
 order: 10
 desc: Folders allow you to group documents across collections, and are a great way to organize your content.
 keywords: folders, folder, content organization
@@ -95,9 +95,7 @@ const config = buildConfig({
     {
       slug: 'pages',
       // highlight-start
-      admin: {
-        folders: true, // defaults to false
-      },
+      folders: true, // defaults to false
       // highlight-end
     },
   ],