add: SEO for articles

SEO and SchemaORg for articles

app/error.vue

@@ -0,0 +1,20 @@
+<template>
+  <section class="bg-radial">
+    <NuxtLayout>
+      <section class="content">
+        <h1>{{ error?.statusCode }}</h1>
+        <p>{{ message }}</p>
+      </section>
+    </NuxtLayout>
+  </section>
+</template>
+<script setup lang="ts">
+import type { NuxtError } from 'nuxt/app'
+
+type Props = {
+  error: NuxtError
+}
+
+const { error } = defineProps<Props>()
+const message = getErrorMessage(error)
+</script>