Competitie usecase: https://xd.adobe.com/view/b81481fb-0e42-49b6-bfe1-cb8dffccd965-ed47/
Speler usecase: https://xd.adobe.com/view/0a0b6f64-ed0a-4627-b127-86517d217cb5-5f58/?fullscreen
Competitiegroepen usecase: https://xd.adobe.com/view/c3d4678d-7da7-4125-82d3-6295b513dc7e-9687/