Rewrite color logic for better flexibility

[Thunear]

We currently use a package called Leonardo JS API to generate the colors for our color-system. This is not a very elegant solution because they base their color generation off of contrast, rather than lightness and luminance from the API. It also gives us a bit less control for how we want to generate the colors. Behind the scenes Leonardo uses Chroma.js to generate colors with relative luminance that also have color interpolation built in.

• Change to use Chroma.js to generate all the colors based on relative luminance.
• Keep using HSLuv lightness-calculations for the Base- and contrast colors for better human color-perception
• Move the luminance values to its own file
• Simplify logic with Ramda