Accounts and login.

components/Header.js

@@ -0,0 +1,14 @@
+import React from 'react';
+import Link from 'next/link';
+
+export default function Header() {
+  return (
+    <header className="container">
+      <h1>
+        <Link href="/">
+          <a>umami</a>
+        </Link>
+      </h1>
+    </header>
+  );
+}