docs: added new guides and troubleshooting related to admin development (#8739)

www/apps/resources/generated/sidebar.mjs

@@ -8371,6 +8371,22 @@ export const generatedSidebar = [
               }
             ]
           },
+          {
+            "loaded": true,
+            "isPathHref": true,
+            "type": "category",
+            "title": "Admin Development",
+            "children": [
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "type": "link",
+                "path": "/troubleshooting/medusa-admin/no-widget-route",
+                "title": "Widget or Route not Showing",
+                "children": []
+              }
+            ]
+          },
           {
             "loaded": true,
             "isPathHref": true,