feat(navbar) update navbar

app/about/page.tsx

@@ -1,8 +1,12 @@
 import React from 'react';
+import ConstructionPlaceHolder from '@/components/ConstructionPlaceHolder';
 
 function About() {
     return (
-        <div></div>
+        <div className={ `h-dvh` }>
+            <ConstructionPlaceHolder />
+        </div>
+
     );
 }