Create a Design System and update all screens in the shared design file #86
Description
The shared Figma file (https://www.figma.com/design/92uqxuUHMbTpBPPXMWE0QA/contribute.design?node-id=89-1626&t=YXwD76yzBQUT8uhH-1 ) contains the existing desktop-size screens and some basic UI components, but
- not the Design System foundations
- not all the components
- not the mobile-size screens
We have to add those elements and screens to have an up-to-date design file and use it for all design improvements.