Moved code into src folder. Added build for component library.

src/components/layout/PageHeader.js

@@ -0,0 +1,14 @@
+import classNames from 'classnames';
+import React from 'react';
+import styles from './PageHeader.module.css';
+
+export function PageHeader({ title, children, className }) {
+  return (
+    <div className={classNames(styles.header, className)}>
+      {title && <div className={styles.title}>{title}</div>}
+      <div className={styles.actions}>{children}</div>
+    </div>
+  );
+}
+
+export default PageHeader;