chore: enhance dark mode on articles

pages/articles/[...slug].vue

@@ -10,7 +10,10 @@ const { path } = useRoute();
 
 <template>
   <ContentDoc :path="path" v-slot="{ doc }">
-    <UContainer class="flex flex-col gap-3 prose" as="article">
+    <UContainer
+      class="flex flex-col gap-3 prose dark:prose-invert"
+      as="article"
+    >
       <div class="text-sm text-slate-500">
         Published at {{ formatDate(new Date(doc.date), "Do of MMMM YYYY") }}
       </div>

pages/articles/index.vue

@@ -5,7 +5,7 @@ definePageMeta({
 </script>
 
 <template>
-  <UContainer class="flex flex-col gap-3 prose">
+  <UContainer class="flex flex-col gap-3 prose dark:prose-invert">
     <h1>Articles</h1>
   </UContainer>