### `MobileNavigationBar`

*Note: use in tandem with `<NavigationBar />` - this component disappears for larger screen sizes*

Navigation bar for smaller screen sizes that uses react-router-dom to display pages

Props:

* string `userName` - User's name that will be displayed (required)
* list `userGroup` - User's group - if falsy the navigation bar will be hidden and only the logo, username, and the logout button will be shown (required)
* list `navItems` - List of objects that will be displayed in the navbar. The object must look like this: `{link: string, name: string}` (required)
* func `logoutHandler` - The function that will be run when the user clicks on the logout button. (required)