detect user agent for mobile

[clamstew]

try to detect user agents so can throw a splash screen up or something on a mobile screen. Telling user to try on desktop with notifs. Seems like could still use the timer but the countdown timer is not showing up on iPhone safari.

httpp://stackoverflow.com/questions/22947535/how-to-detect-browser-using-angular

Could also detect browsers with support for notifs among other things.