Review and update Design foundations

[edonehoo]

Tasks

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1. Review and update colors guidelines #3652
   Content +1
   
2. Review and update spacers guidelines #3691
   Content +1
   
3. Review and update typography guidelines #3694
   Content +1
   
4. Review and update usage and behavior guidelines #3734
   Content +1
   
5. Review and update icons guidelines #3651
   Content +1