Enable or disable the dark theme

TimeTree has a built-in feature that allows you to enable or disable the dark theme.

Instructions:

1. Tap the three horizontal lines in the top left-hand corner of the screen
2. Tap the "App Settings" button on the upper right corner.
3. iOS: Navigate to "Appearance" and choose "Use device settings", "Light Mode" or "Dark Mode"
   Android: Navigate to "Appearance", tap "Dark mode" and select  "On/Off"