Refactored settings components.

components/pages/settings/websites/TrackingCode.js

@@ -0,0 +1,16 @@
+import { TextArea } from 'react-basics';
+import { TRACKER_SCRIPT_URL } from 'lib/constants';
+
+export default function TrackingCode({ websiteId }) {
+  const code = `<script async src="${TRACKER_SCRIPT_URL}" data-website-id="${websiteId}"></script>`;
+
+  return (
+    <>
+      <p>
+        To track stats for this website, place the following code in the <code>&lt;head&gt;</code>{' '}
+        section of your HTML.
+      </p>
+      <TextArea rows={4} value={code} readOnly allowCopy />
+    </>
+  );
+}