[UI] Improve the color palette for the 6 categories

[FrancyCavallari]

We currently use this one: https://colorkit.co/palette/d12229-f68a1e-fde01a-007940-24408e-732982/

[FrancyCavallari]

Should we change the order of the colors/categories? Curently we have:

• blue
• red
• purple
• yellow
• orange
• green