SilverStripe\Widgets\Extensions\WidgetPageExtension

Adds a single {@link WidgetArea} called "SideBar" to {@link Page} classes.

Adjust your templates to render the resulting
{@link WidgetArea} as required, through the $SideBarView placeholder.

This extension is just an example on how to use the widgets functionality,
feel free to create your own relationships, naming conventions, etc.
without using this class.