Create Tailwind config preset

[BorghildSelle]

Try to move our tailwind config to a separate folder (
should we call it "packages", with subfolder theme and tailwind?
In the future more packages might come, e.g. core, sections, templates )
that is exported as a package, which in the future can be published to npm, but in the first version just reside in folder and used as workspace and imported to web tailwind config like:
presets: [
require('./packages/theme/tailwind/equinor-preset.js')
],

See more:
https://tailwindcss.com/docs/presets