feat: add storybook

stories/Header.js

@@ -0,0 +1,47 @@
+import { createButton } from './Button';
+import './header.css';
+
+export const createHeader = ({ user, onLogout, onLogin, onCreateAccount }) => {
+  const header = document.createElement('header');
+
+  const wrapper = document.createElement('div');
+  wrapper.className = 'storybook-header';
+
+  const logo = `<div>
+    <svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+      <g fill="none" fillRule="evenodd">
+        <path
+          d="M10 0h12a10 10 0 0110 10v12a10 10 0 01-10 10H10A10 10 0 010 22V10A10 10 0 0110 0z"
+          fill="#FFF" />
+        <path
+          d="M5.3 10.6l10.4 6v11.1l-10.4-6v-11zm11.4-6.2l9.7 5.5-9.7 5.6V4.4z"
+          fill="#555AB9" />
+        <path d="M27.2 10.6v11.2l-10.5 6V16.5l10.5-6zM15.7 4.4v11L6 10l9.7-5.5z" fill="#91BAF8" />
+      </g>
+    </svg>
+    <h1>Acme</h1>
+  </div>`;
+
+  wrapper.insertAdjacentHTML('afterbegin', logo);
+
+  const account = document.createElement('div');
+  if (user) {
+    const welcomeMessage = `<span class="welcome">Welcome, <b>${user.name}</b>!</span>`;
+    account.innerHTML = welcomeMessage;
+    account.appendChild(createButton({ size: 'small', label: 'Log out', onClick: onLogout }));
+  } else {
+    account.appendChild(createButton({ size: 'small', label: 'Log in', onClick: onLogin }));
+    account.appendChild(
+      createButton({
+        size: 'small',
+        label: 'Sign up',
+        onClick: onCreateAccount,
+        primary: true,
+      })
+    );
+  }
+  wrapper.appendChild(account);
+  header.appendChild(wrapper);
+
+  return header;
+};