Converts notebook to an iterable of BS4 HTML nodes. Images are inline.

def nb_to_html_cells(nb) -> list:
    """
    Converts notebook to an iterable of BS4 HTML nodes. Images are inline.
    """
    html_exporter = HTMLExporter()
    html_exporter.template_file = 'basic'

    (body, resources) = html_exporter.from_notebook_node(nb)
    return BeautifulSoup(body, 'html.parser').findAll('div', class_='cell')