[m-gallery] Check if it is accessibility #1
Description
- Use nav element for pagination and next/prev.
- Add role to web component
- Add aria-label to web component
https://inclusive-components.design/a-content-slider/
https://www.smashingmagazine.com/2023/02/guide-building-accessible-carousels/
https://www.w3.org/WAI/tutorials/carousels/