Display page views and unique visitors.

components/WebsiteSummary.js

@@ -0,0 +1,16 @@
+import React from 'react';
+import MetricCard from './MetricCard';
+import styles from './WebsiteSummary.module.css';
+
+function getTotal(data) {
+  return data.reduce((n, v) => n + v.y, 0);
+}
+
+export default function WebsiteSummary({ data }) {
+  return (
+    <div className={styles.container}>
+      <MetricCard label="Views" value={getTotal(data.pageviews)} />
+      <MetricCard label="Visitors" value={getTotal(data.uniques)} />
+    </div>
+  );
+}