docs: def remove_existing_links(root_dir):
      """Delete any symlinks present at the root of a directory.
  
      Parameters
      ----------
      root_dir : `str`
          Directory that might contain symlinks.
  
      Notes
      -----
      This function is used to remove any symlinks created by `link_directories`.
      Running ``remove_existing_links`` at the beginning of a build ensures that
      builds are isolated. For example, if a package is un-setup it won't
      re-appear in the documentation because its symlink still exists.
      """
      logger = logging.getLogger(__name__)
  
      for name in os.listdir(root_dir):
          full_name = os.path.join(root_dir, name)
          if os.path.islink(full_name):
              logger.debug('Deleting existing symlink {0}'.format(full_name))
              os.remove(full_name)