Hello,
We have created Categories list staic block as an example http://prntscr.com/li6amx
Used some custom CSS to style it in the way we need http://prntscr.com/li6b4f
And added the static block shortcode into shop banner area http://prntscr.com/li6bnu , you can use static block shortcode to add the categories links to your categories top http://prntscr.com/li6cr4
Regards