Dynamically change aria-* attributes #43
Description
Currently keyboard-navigation forces you to tab through all slide entries. Maybe the tabindex should only be on the interactive elements (prev/next buttons and pagination in the future). but for this it would need to have aria-hidden attributes, as well as a property passed to Slide's slot exposing if the tab is currently visible (to be able to manually disable interactive elements inside the slide, so keyboard navigation works flawlessly) (note: vue-carousel did also use aria role "tabpanel", but that's not implemented correctly and didn't pass our audit)
Related to #3