docs: add example on how to disable default routes for ssg (#30729)

docs/2.guide/1.concepts/3.rendering.md

@@ -126,6 +126,26 @@ This will produce three files:
 
 The `200.html` and `404.html` might be useful for the hosting provider you are using.
 
+#### Skipping Client Fallback Generation
+
+When prerendering a client-rendered app, Nuxt will generate `index.html`, `200.html` and `404.html` files by default. However, if you need to prevent any (or all) of these files from being generated in your build, you can use the `'prerender:generate'` hook from [Nitro](/docs/getting-started/prerendering#prerendergenerate-nitro-hook).
+
+```ts twoslash [nuxt.config.ts]
+export default defineNuxtConfig({
+  ssr: false,
+  nitro: {
+    hooks: {
+      'prerender:generate'(route) {
+        const routesToSkip = ['/index.html', '/200.html', '/404.html']
+        if (routesToSkip.includes(route.route)) {
+          route.skip = true
+        }
+      }
+    }
+  }
+})
+```
+
 ## Hybrid Rendering
 
 Hybrid rendering allows different caching rules per route using **Route Rules** and decides how the server should respond to a new request on a given URL.