Mobile Nav dropdown is behind the schedule.

[AlexanderPuhl]

Need a z-index so the schedule isn't in front of the mobile nav menu.

[jgbowser]

@AlexanderPuhl I was going to get started on this ticket, but it looks like it isn't actually an issue with this year's schedule. I think there was maybe some custom styling on the previous schedule which caused this. Looks like this issue can just be closed out.