* Update index.js
This PR added companion cookies rule to every provider except Box.
https://github.com/transloadit/uppy/pull/2618
(Not sure if there's a reason Box was left out)
* Update docs for the change
* Introduce opts.disabled for the Dashboard
* Reduce opacity, disable user-select, set cursor
* Add classes to providers' background circles
So they can be grayscaled via css
* add disableAllFocusableElements and run it in afterUpdate hook, if needed
* increase opacity for readability
* Store previous tabindex value and use it when restoring (setting disable: false)
//cc @goto-bus-stop
* Add disabled docs
* add disabled option to website example
Co-authored-by: Alexander Zaytsev <nqst@users.noreply.github.com>