[Spike] Accessibility checks

[dzhavat]

We need a way to run automated accessibility checks locally as well as on CI in order to ensure that our apps and components meet the latest Web Content Accessibility Guidelines (WCAG) standard.

Acceptance Criteria

• [ ] Investigate what's built into Storybook (AA compliance?)
• [ ] Find a tool that can verify that we're AA compliant on app and component level (Lighthouse, Axe)
• [ ] Investigate WAS-tool