TEST - Add automated accessibility tests to the PyData Sphinx theme

[trallard]

📝 Summary

As we work on improving WCAG conformance and accessibility remediation, we must also ensure we can detect regressions and run automated audits (as possible) of the theme.

Tasks

Beta Give feedback

1. ENH - Improvements to automated accessibility tests pydata/pydata-sphinx-theme#1168
   tag: accessibility +1
2. ENH - Improve reporting of automated tests #28
   2 of 3
   area: CI/CD 👷🏻 area: PyData-Sphinx area: accessibility ♿ mission: access-centred ♿ +4
   
3. MAINT: Broaden coverage of accessibility tests with Playwright pydata/pydata-sphinx-theme#1378
   kind: maintenance tag: accessibility +2
   

Additional details

• Definition of done:
  • a minimal set of tests with Playwright and axe-core run on the Kitchen sink theme (for both dark and light theme)
  • documentation in the accessibility section of the developer docs
• Follow-up:
  • As this is a testing MVP we would need to iterate on reporting and expanding the tests based on the theme and needs