Add an accessibility section to the documentation for each component

[sandbergja]

Introduction

For each component, we should have an accessibility section that describes:

• accessibility features of the component
• considerations that you need to keep in mind when using this component in your application

We are particularly inspired by Mercury, the design system from the Canada Post, which has an Accessibility Tab in the documentation for each of its components.

Acceptance criteria

• [ ] Each component has an accessibility section

Implementation notes

We could create a custom component for displaying Accessibility information in the documentation.