start over with nextjs

components/Layout.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+
+import Header from './Header';
+
+export default function(props) {
+  return (
+    <div id="app">
+      <Header />
+      <div id="content">
+        { props.children }
+      </div>
+    </div>
+  );
+}