Allow configuration of `designsystemet build` output directory in the config file

[Svish]

Description

I like to have config in config files, rather than in npm scripts, so it would be very nice I could configure the output directory of designsystemet build in the config file as well. Would also be nice if the clean option could be configured for both create and build.

For example:

{
  "$schema": "node_modules/@digdir/designsystemet/dist/config.schema.json",
  "tokens": {
    "outDir": "./design-tokens",
    "clean": true
  },
  "build": {
    "outDir": "./src/styles/designsystemet",
    "clean": true
  },
  "themes": {
    // ...
  }
}

Additional Information

No response