Add a Service Browser/Homepage to https://planning.worshiptools.com/music-stand/

Make Music Stand Web Version standalone by adding homepage/service-browser to https://planning.worshiptools.com/music-stand/ and avoiding popping up the "are you sure you don't want to download the iOS/Android apps" nag dialog on non-mobile platforms.

This will make it much easier for users who don't want to have to click through the main planning view to reach the Music Stand view for a service and make it easier to administer access for members of worship teams who don't need to see the full Scheduling Matrix, etc...