chore: set index to each page

app/encoders-decoders/layout.tsx

@@ -4,6 +4,11 @@ import { toolGroups } from "@/config/tools";
 
 export const metadata: Metadata = {
   title: toolGroups.encodersDecoders.title,
+  robots: {
+    googleBot: {
+      index: false,
+    },
+  },
 };
 
 export default function Layout({ children }: { children: React.ReactNode }) {