Don't load the navigable list controller on mobile

app/javascript/helpers/platform_helpers.js

@@ -0,0 +1,15 @@
+export function isTouchDevice() {
+  return "ontouchstart" in window && navigator.maxTouchPoints > 0
+}
+
+export function isIos() {
+  return /iPhone|iPad/.test(navigator.userAgent)
+}
+
+export function isAndroid() {
+  return /Android/.test(navigator.userAgent)
+}
+
+export function isMobile() {
+  return isIos() || isAndroid()
+}