docs: def get_gmn_version(base_url):
      """Return the version currently running on a GMN instance.
  
      (is_gmn, version_or_error)
  
      """
      home_url = d1_common.url.joinPathElements(base_url, 'home')
      try:
          response = requests.get(home_url, verify=False)
      except requests.exceptions.ConnectionError as e:
          return False, str(e)
  
      if not response.ok:
          return False, 'invalid /home. status={}'.format(response.status_code)
  
      soup = bs4.BeautifulSoup(response.content, 'html.parser')
      version_str = soup.find(string='GMN version:').find_next('td').string
      if version_str is None:
          return False, 'Parse failed'
  
      return True, version_str