Get the links of youtube videos from settings

Add the links to settings and get it from the API to switch them based on the domain name

Event registration
https://www.youtube.com/watch?v=cIvwKqoSkh0

Android setup
 https://www.youtube.com/watch?v=sb-VPyNE7Es

Iphone setup
https://youtu.be/-wgpO-q4d5k

