Improve accessibility

[onmax]

Description

To make our app more friendly for assistive technologies, we should implement the following improvements to support screen readers, keyboard navigation, and other tools.

Tasks

• Mark decorative containers: Add aria-hidden="true" to any
  that only holds icons (e.g. those using the i-nimiq:... syntax) or is otherwise empty/decorative.
• Provide meaningful alt text on images and icons that convey information.
• Follow other best practices
• Ensure focus indicators are visible for keyboard users.
• Clarify structure for screen readers
• Establish a clear heading hierarchy (H1 → H2 → H3).
• Add a “Skip to content” link at the top of each page.
• Improve blog posts for screen readers—see this video for guidance on /blog.

Discussion

• Are there any other accessibility checks we should include?
• What’s the best approach for testing—manual review vs. automated tooling (e.g. axe, Lighthouse)?

Done when:

• All checklist items are implemented.
• CI passes