add: SEO for articles

SEO and SchemaORg for articles

app/pages/blog/[slug].vue

@@ -5,29 +5,54 @@
       Zurück zur Übersicht
     </NuxtLink>
 
-    <p v-if="!article">
-      Sorry bro, aber der Artikel existiert einfach nicht.
-    </p>
-
-    <div v-else>
+    <main v-if="article" class="article-content z-3">
+      <div class="image z-2">
+        <img :src="article.image" alt="Artikelbild" aria-hidden="true"/>
+      </div>
       <header>
-        <div class="image z-2">
-          <img :src="article.image" alt="Artikelbild" aria-hidden="true"/>
+        <div class="meta">
+          <NuxtLink :to="`/blog/?category=${article.category}`">
+            <span class="chip interactive"><BlogCategory :name="article.category as Category"/></span>
+          </NuxtLink>
         </div>
         <h1 class="margin-top">{{ article.title }}</h1>
         <h2>{{ article.description }}</h2>
       </header>
-      <div class="flex-col gap-default">
+      <div class="flex-col gap-default article-text">
         <ContentRenderer v-if="article" :value="article" :style="{ display: 'contents' }"/>
       </div>
-    </div>
+    </main>
   </section>
 </template>
 
 <script setup lang="ts">
+import type { Category } from '../../components/Blog/types'
+
 const route = useRoute()
 
 const { data: article } = await useAsyncData('article', () => queryCollection('blog').path(route.path).where('date', '<', tomorrow(new Date())).first())
+
+if (!article.value) {
+  throw createError({
+    statusCode: 404,
+    statusMessage: 'Page Not Found',
+  })
+} else {
+  useHead(article.value.head || {})
+  useSeoMeta({
+    ...(article.value.seo || {}),
+    ogTitle: article.value.title,
+    ogDescription: article.value.description,
+    ogImage: article.value.image,
+    ogImageAlt: article.value.description,
+    ogUrl: `https://webfussel.de${article.value.path}`,
+    twitterTitle: article.value.title,
+    twitterDescription: article.value.description,
+    twitterImage: article.value.image,
+    twitterImageAlt: article.value.description,
+    twitterUrl: `https://webfussel.de${article.value.path}`,
+  })
+}
 </script>
 
 <style scoped>