feat: work on displaying doc structure in sidebar

src/app/page.tsx

@@ -1,9 +1,10 @@
+import Article from './components/Article';
 import styles from './page.module.css';
 
 export default function Home() {
   return (
-    <div className={styles.container}>
-      <h1 className={styles.title}>Onspring API Docs</h1>
-    </div>
+    <main className={styles.container}>
+      <Article />
+    </main>
   );
 }