feat: support layouts (#56)

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

src/pages/[...all].vue

@@ -9,3 +9,8 @@ const { t } = useI18n()
     {{ t('not-found') }}
   </div>
 </template>
+
+<route lang="yaml">
+meta:
+  layout: 404
+</route>

src/pages/index.vue

@@ -53,3 +53,8 @@ const { t } = useI18n()
     </div>
   </div>
 </template>
+
+<route lang="yaml">
+meta:
+  layout: home
+</route>