Sidebar is simple container for sidebar items. It consists of
<SidebarContentOverlay> components should be added to your root element (in default project:
<Sidebar> you should put your sidebar links, etc.
<SidebarContentOverlay> is used as transparent black overlay which is displayed
on mobile devices and when clicked on closes the sidebar.
You can control the visibility of sidebar by using global
methods which are available in any component instance.
By default, on mobile and small devices sidebar is initially closed.