def save
      # Don't save default values
      save_config = Rails.application.config.theme.reject { |k, _| @defaults.keys.include?(k) }
      full_config[Rails.env].merge!(save_config)
      File.open(config_pathname, 'w') { |f| f << full_config.to_yaml }
    end
def save
      # Don't save default values
      save_config = Rails.application.config.theme.reject { |k, _| @defaults.keys.include?(k) }
      full_config[Rails.env].merge!(save_config)
      File.open(config_pathname, 'w') { |f| f << full_config.to_yaml }
    end
Save the current state of the theme config to the theme.yml file