chore: update Nuxt example (#10869)

This updates the default Nuxt example to start with a static route, plus
updates dependencies with the latest version.

Demo: https://nuxt-vercel-inky.vercel.app/

---------

Co-authored-by: Trek Glowacki <trek.glowacki@vercel.com>

examples/nuxtjs/nuxt.config.ts

@@ -1,5 +1,8 @@
-export default {
-  nitro: {
-    preset: 'vercel-edge',
+// https://nuxt.com/docs/api/configuration/nuxt-config
+export default defineNuxtConfig({
+  devtools: { enabled: true },
+  routeRules: {
+    // prerender index route by default
+    '/': { prerender: true },
   },
-};
+});