the idea of this patch is to use the same (default bootstrap layout)
navbar on all devices.

unfortunately for a vertical version of the default navbar we still
need two copies of the navbar. once outside of the grid for small
screens, to ensure that the navbar is on top of the content. And
a second time inside of the grid in a flex-column to the left.

also refactor the menu code to have a more declarative description
of the menu, that we could move the the config of the app, or even
automatically generate from the routes.