fix: use nuxt-link instead of anchor tag (#785)

refactor(docs): use nuxt-link instead of anchor tag

Author: rvdriest

docs/quick-starts/framework/nuxt/_get-user-information.mdx

@@ -22,7 +22,7 @@ When user is signed in, the return value of `useLogtoUser()` will be an object c
   </ul>
   <!-- highlight-end -->
   <!-- Simplified button for sign-in and sign-out -->
-  <a :href="`/sign-${ user ? 'out' : 'in' }`"> Sign {{ user ? 'out' : 'in' }} </a>
+  <nuxt-link :to="`/sign-${ user ? 'out' : 'in' }`"> Sign {{ user ? 'out' : 'in' }} </nuxt-link>
 </template>
 ```
 

docs/quick-starts/framework/nuxt/_integration.mdx

@@ -84,7 +84,7 @@ Since Nuxt pages will be hydrated and become a single-page application (SPA) aft
 </script>
 <template>
   <!-- Simplified button for sign-in and sign-out -->
-  <a :href="`/sign-${ user ? 'out' : 'in' }`"> Sign {{ user ? 'out' : 'in' }} </a>
+  <nuxt-link :to="`/sign-${ user ? 'out' : 'in' }`"> Sign {{ user ? 'out' : 'in' }} </nuxt-link>
 </template>
 ```