code: func readAssetOrIndex(path string) (string, []byte, error) {
  	b, err := Asset(path)
  	if err != nil {
  		path = "config/index.html"
  		b, err = Asset(path)
  		if err != nil {
  			return path, nil, err
  		}
  	}
  
  	return path, b, nil
  }
docs: // Try to read a local/embedded asset. Gracefully fail and read index.html if
  // if not found.