docs: bump challenge count

docs/.vitepress/theme/components/Benchmark.vue

@@ -2,7 +2,7 @@
 import { ref } from "vue";
 
 const difficulty = ref(4);
-const challenges = ref(18);
+const challenges = ref(50);
 const challengeSize = ref(32);
 const workers = ref(8);
 const benchmarks = ref(1);

docs/.vitepress/theme/components/Demo.vue

@@ -7,7 +7,7 @@ onMounted(() => {
       const browserCrypto = window.crypto;
       return new Response(
         JSON.stringify({
-          challenge: Array.from({ length: 18 }, () => [
+          challenge: Array.from({ length: 50 }, () => [
             Array.from(
               browserCrypto.getRandomValues(new Uint8Array(Math.ceil(32 / 2)))
             )