code: protected function loadDefaultConfig(array $config)
      {
          $configurator = new PluginConfigurator;
          $validConfig = $configurator->validate(
              isset($config[self::PLUGIN_NAME]) ? $config[self::PLUGIN_NAME] : null
          );
          
          return $validConfig;
      }
docs: Applies a default plugin configuration to the Pico config file.
  
  @param array $config Configuration of Pico CMS; plugin's specific
  configuration is under PLUGIN_NAME index.