Include PWACompat for iOS (#310)

src/_js/main.mjs

@@ -107,3 +107,10 @@ ga('send', 'pageview');
 const gaScript = document.createElement('script');
 gaScript.src = 'https://www.google-analytics.com/analytics.js';
 document.head.appendChild(gaScript);
+
+// On Apple mobile devices add the proprietary app icon and splashscreen markup.
+// No one should have to do this manually, and eventually this annoyance will
+// go away once https://bugs.webkit.org/show_bug.cgi?id=183937 is fixed.
+if (/\b(iPad|iPhone|iPod)\b/.test(navigator.userAgent)) {
+  import('https://unpkg.com/pwacompat');
+}