add axe-core accessibility tests

[underdarknl]

Is your feature request related to a problem? Please describe. Add accessibility tests for websites based on axe-core.

Describe the solution you'd like Implement an Axe-core check based on our already available har files of possible

https://github.com/dequelabs/axe-core

Describe alternatives you've considered Run the boefje directly on the website, possible via playwright