LPS-39161 Move split dockbar styling from classic theme to _styled theme
LPS-39161 - SF: Certain styles should be scoped to only dockbar-split
LPS-39161 - SF: Centralizing important values
LPS-39161 - SF: hiding the dockbar until we can interact with it (to prevent frustrating experience of non-responsive clicking)
LPS-39161 - Source formatting