docs: def slugify(self, value):
          """
          Normalizes string, converts to lowercase, removes non-alpha characters,
          and converts spaces to hyphens.
          """
          value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
          value = unicode(re.sub('[^\w\s-]', '', value).strip().lower())
          return re.sub('[-\s]+', '-', value)