fix(sidebar): unlist hackathon sidebar (#573)

Author: dineshpinto

sidebars.ts

@@ -16,11 +16,12 @@ const sidebars: SidebarsConfig = {
     {
       type: "category",
       label: "Verifiable AI Hackathon",
+      collapsed: true,
       link: {
-        type: "generated-index",
+        type: "doc",
+        id: "hackathon/onboarding",
       },
-      collapsed: true,
-      items: [{ type: "autogenerated", dirName: "hackathon" }],
+      items: ["hackathon/onboarding"],
     },
     {
       type: "category",