chore(ui): ux docs - add Accessibility page

[franzheidl]

Summary

Add a page covering basic Accessibility guidelines.

Related Issues

Closes #1918

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.
• I have created a changeset for my changes.

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Latest commit: ca0ff4e

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