fix(nav-bar): update keyboard navigation to WAI-ARIA guidelines (#11494)

- stop blocking shift-tab from moving focus away from the nav-bar
- enable the use of the home and end keys
- wrap to the first/last tab when hitting the end
- properly manage nav item tabindex values
- skip over disabled tabs instead of leaving focus in a bad state
- remove click listener on destroy
- document keyboard behaviors
- fix bad linking syntax in API docs
- update to latest karma version

Fixes #10419. Relates to #11489.

Author: Splaktar