Turn calendar download link into an icon, vendor font awesome for that.

assets/js/calendar.js

@@ -0,0 +1,15 @@
+// Calendar shortcode: on Android, the calendar links add the date in Google Calendar instead of
+// downloading the .ics file, because the Google Calendar app there can't open .ics files.
+{
+  const isAndroid =
+    navigator.userAgentData?.platform === 'Android' || /\bAndroid\b/i.test(navigator.userAgent);
+
+  if (isAndroid) {
+    for (const link of document.querySelectorAll('a.tour-calendar[data-google-href]')) {
+      link.href = link.dataset.googleHref;
+      link.removeAttribute('download');
+      link.title = link.dataset.googleTitle;
+      link.querySelector('.visually-hidden').textContent = link.dataset.googleLabel;
+    }
+  }
+}