* Extract userbar BaseItem.get_context_data()
* Extract Axe config into smaller attributes and methods for easier overrides
* Add TypeScript interface for WagtailAxeConfiguration
* Improve typings for userbar.ts
* Separate Axe `runOnly` and `rules` options
* Pass request object to all axe configuration methods
* Remove Axe runOnly option if it's falsy
* Add docs for customising the accessibility checker
* Use lists for Axe include and exclude selectors
* Parse JSON script when testing accessibility checker config
* Add tests for customising accessibility checker configuration
Co-authored-by: Thibaud Colas <thibaudcolas@gmail.com>
