add theme nav & add pageIcon support of @lib/getNotionData

themes/nav/components/LeftMenuBar.js

@@ -0,0 +1,16 @@
+import Link from 'next/link'
+import React from 'react'
+
+export default function LeftMenuBar () {
+  return (
+    <div className='w-20  border-r hidden lg:block pt-12'>
+      <section>
+        <Link href='/' legacyBehavior>
+          <div className='text-center cursor-pointer  hover:text-black'>
+            <i className='fas fa-home text-gray-500'/>
+          </div>
+        </Link>
+      </section>
+    </div>
+  );
+}