* correct typography styles for remove link (based on design)
* add trashcan icon from material icons, for removing cart items on mobile
* add & style trash icon for remove cart item on mobile
* a11y - use darker grey for trashcan icon button to improve contrast
* rename IconDelete -> IconTrash
* remove unnecessary div
* use <button> for remove action buttons + add link-button scss mixin
* fix editor styles for cart line items - total column should be right-aligned
* fix various visual issues with cart line items table in editor:
- rows should align hard left and right (first/last child no padding)
- totals should be align-bottom on small screen
- correct vertical padding on column headings
- re-add row border separator lines
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