feat: add some highlighting to markdown renderer

routes/articles/[name].tsx

@@ -42,7 +42,9 @@ export default function Greet(props: PageProps<Article>) {
           <YoutubePlayer link={article.meta.link} />
         )}
         <pre
-          class="whitespace-break-spaces"
+          class="whitespace-break-spaces markdown-body"
+          data-color-mode="dark"
+          data-dark-theme="dark"
           dangerouslySetInnerHTML={{ __html: article.content || "" }}
         >
           {article.content||""}