feat: allow customization with options

[takacspeter]

#43

Configuration as follows in nuxt.config.js

export default {
  build: {
    loadingScreen: {
      image: '<URL or absolute to staticDir>',
      colors: {
        client: 'hotpink',
        server: 'red'
      }
    }
  }
}

The image can be located in static directory of nuxt project or be a URL.

[pi0]

Hi @takacspeter thanks for PR ❤️ I made few changes and rebased with latest branch. Will be release with v2 (nuxt 2.13)

[AdrianoCahete]

Hi @pi0 there's no mention of this feature in Config options. This feature was landed or just postponed to another version?

I'm asking because I'm in an older version and I'm trying to see if make sense to me to update to the latest now or if I can wait for some more time...