code: function getAssetsUrl(skyPagesConfig, baseUrl, rel) {
    return baseUrl + skyPagesConfig.runtime.app.base + (rel || '');
  }
docs: Gets the assets URL with the application's root directory appended to it.
  @param {*} skyPagesConfig The SKY UX app config.
  @param {*} baseUrl The base URL where the assets will be served.
  @param {*} rel An additional relative path to append to the assets base URL
  once the application's root directory has been appended.