POC: Theme builder

[mrosvik]

Tasks for Beta version (29. mai)

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1. Bachelor's thesis with interviews and user testing of prototype
2. Easier to theme tokens directly in css #1036
   $ tokens ⚙️ technical +2
   
3. Theme Builder - Design #1377
   🎨 figma 🎨 theme-builder +2
   
4. Test and land new color scales #1843
   🕵️ investigate +1
   
5. Contrast colors #2044
   🎨 theme-builder +1
   
6. Warning messages modals on color combinations #2045
   🎨 theme-builder +1
   
7. The switch button checkmark has wrong color

Tasks for later versions

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1. Make use of Brreg Contrast checker in the theme builder https://contrast.brreg.no/

[mimarz]

We have built a theme-builder now and will handle future enchancements with new epic, labels and milestones.