docs: update outdated link in sitemap.md (#1772)

docs/content/3.guide/3.recipes/1.sitemap.md

@@ -18,7 +18,7 @@ This can be created by utilising the `sitemap` library, which can be installed a
 
 ## Server Route
 
-We will be utilising the [server routes](https://v3.nuxtjs.org/guide/features/server-routes) available within Nuxt, and to do so you'll need to create the `server/` directory within your website's root directly.
+We will be utilising the [server routes](https://nuxt.com/docs/guide/directory-structure/server#server-routes) available within Nuxt, and to do so you'll need to create the `server/` directory within your website's root directly.
 
 Once this is done, create a `routes/` directory inside this, and add a `sitemap.xml.ts` file, this will translate to `/sitemap.xml`.