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/.storybook/main.ts

@@ -3,7 +3,11 @@ import { mergeConfig } from 'vite'
 
 const config: StorybookConfig = {
   framework: '@storybook/nextjs-vite',
-  stories: ['../lib/**/*.mdx', '../lib/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
+  stories: [
+    '../lib/**/*.mdx',
+    '../lib/**/*.stories.@(js|jsx|mjs|ts|tsx)',
+    './content/**/*.mdx',
+  ],
   addons: [
     '@storybook/addon-links',
     '@storybook/addon-themes',