code: def write_pa11y_results(item, pa11y_results, data_dir):
      
      data = dict(item)
      data['pa11y'] = pa11y_results
  
      # it would be nice to use the URL as the filename,
      # but that gets complicated (long URLs, special characters, etc)
      # so we'll make the filename a hash of the URL instead,
      # and throw in the access time so that we can store the same URL
      # multiple times in this data directory
      hasher = hashlib.md5()
      hasher.update(item["url"].encode('utf8'))
      hasher.update(item["accessed_at"].isoformat().encode('utf8'))
      basename = hasher.hexdigest()
      filename = basename + ".json"
      filepath = data_dir / filename
      data_dir.makedirs_p()
      text = json.dumps(data, cls=DateTimeEncoder)
      filepath.write_text(text)
docs: Write the output from pa11y into a data file.