Update "Back To Samples" button#87

Open

teckliew wants to merge 5 commits intodevelopfrom

feature/update-back-button

Commits on Jan 21, 2020

update all samples back button
Teck Liew
committed
use IconButton instead
Teck Liew
committed
add prop validation to fix linting
Teck Liew
committed

Commits on Jan 22, 2020

Moonstonify the back button
Teck Liew
committed
clean up css
Teck Liew
committed