Merged in feat/SW-3636-storybook-structure (pull request #3309)

feat(SW-3636): Storybook structure

* New sections in Storybook sidebar

* Group Storybook content files and add token files for spacing, border radius and shadows


Approved-by: Joakim Jäderberg

packages/design-system/lib/components/Avatar/Avatar.stories.tsx

@@ -4,7 +4,7 @@ import { Avatar } from '.'
 import { config } from './variants'
 
 const meta: Meta<typeof Avatar> = {
-  title: 'Components/Avatar',
+  title: 'Core Components/Avatar',
   component: Avatar,
   parameters: {
     layout: 'centered',