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/Alert/Alert.stories.tsx

@@ -4,7 +4,7 @@ import { AlertTypeEnum } from '@scandic-hotels/common/constants/alert'
 import { expect, fn } from 'storybook/test'
 
 const meta: Meta<typeof Alert> = {
-  title: 'Components/Alert',
+  title: 'Core Components/Alert',
   component: Alert,
   parameters: {
     layout: 'centered',