docs: Update sidebars.js to remove the duplicate entry for JS client (#4402)

www/docs/sidebars.js

@@ -2244,15 +2244,6 @@ module.exports = {
         sidebar_icon: "javascript",
       },
     },
-    {
-      type: "doc",
-      id: "js-client/overview",
-      label: "Medusa JS Client",
-      customProps: {
-        sidebar_is_title: true,
-        sidebar_icon: "javascript",
-      },
-    },
     {
       type: "category",
       collapsed: false,