Post titles link to /post/:id page.

frontend/components/PostPreview.vue

@@ -1,6 +1,9 @@
 <template>
   <div>
-    <h2>{{ post.title }}</h2>
+    <router-link :to="`/post/${ post.id }`">
+      <h2>{{ post.title }}</h2>
+    </router-link>
+
     <p><span>{{ post.date }}</span> by <span>{{ post.author }}</span></p>
 
     <img v-if="post.thumbnail" :src="post.thumbnail" />