docs: def improve():
      """Disables access to websites that are defined as 'distractors'"""
      with open(settings.HOSTS_FILE, "r+") as hosts_file:
          contents = hosts_file.read()
          if not settings.START_TOKEN in contents and not settings.END_TOKEN in contents:
              hosts_file.write(settings.START_TOKEN + "\n")
              for site in set(settings.DISTRACTORS):
                  hosts_file.write("{0}\t{1}\n".format(settings.REDIRECT_TO, site))
                  for sub_domain in settings.SUB_DOMAINS:
                      hosts_file.write("{0}\t{1}.{2}\n".format(settings.REDIRECT_TO, sub_domain, site))
              hosts_file.write(settings.END_TOKEN + "\n")
  
      reset_network("Concentration is now improved :D!")