New components, convert hooks to components, bug fixes.

components/Button.js

@@ -0,0 +1,13 @@
+import React from 'react';
+import classNames from 'classnames';
+import Icon from './Icon';
+import styles from './Button.module.css';
+
+export default function Button({ icon, children, className, onClick }) {
+  return (
+    <button type="button" className={classNames(styles.button, className)} onClick={onClick}>
+      {icon && <Icon icon={icon} />}
+      {children}
+    </button>
+  );
+}