update packages and add valign

scripts/reveal.js/js/utils/device.ts

@@ -0,0 +1,9 @@
+const UA = navigator.userAgent;
+
+export const isMobile =
+	/(iphone|ipod|ipad|android)/gi.test(UA) ||
+	(navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1); // iPadOS
+
+export const isChrome = /chrome/i.test(UA) && !/edge/i.test(UA);
+
+export const isAndroid = /android/gi.test(UA);