flex_subtitle = "built using jupyter-flex"
flex_external_link = "https://github.com/danielfrg/jupyter-flex/blob/master/examples/layouts/section-columns.ipynb"
flex_show_source = True
"page 1 - col 1"
"page 1 - col 2 - card 1"
"page 1 - col 2 - card 2"
"page 2 - row 1"
"page 2 - row 2 - card 1"
"page 2 - row 2 - card 2"