Stacking <button>'s

`<button>`'s won't get expanded to full width if stacked (orientation == vertical).
Update cursor value to not-allowed for disabled components
Merge pull request #6113 from flexbox/feature/update-disabled-cursor

Cursor need some love for accessibility
updates all js docs pages with reflow info
Merge pull request #6103 from wolfgang-demeter/patch-3

Stacking <button>'s