Convert a notebook `fname` to html file in `dest_path`.

def convert_nb(fname, dest_path='.'):
    "Convert a notebook `fname` to html file in `dest_path`."
    from .gen_notebooks import remove_undoc_cells, remove_code_cell_jupyter_widget_state_elem
    nb = read_nb(fname)
    nb['cells'] = remove_undoc_cells(nb['cells'])
    nb['cells'] = remove_code_cell_jupyter_widget_state_elem(nb['cells'])
    fname = Path(fname).absolute()
    dest_name = fname.with_suffix('.html').name
    meta = nb['metadata']
    meta_jekyll = meta['jekyll'] if 'jekyll' in meta else {'title': fname.with_suffix('').name}
    meta_jekyll['nb_path'] = f'{fname.parent.name}/{fname.name}'
    with open(f'{dest_path}/{dest_name}','w') as f:
        f.write(exporter.from_notebook_node(nb, resources=meta_jekyll)[0])