Don't color PB shop/trade buttons purple in Item Getting Guide

I think it's clearer to just keep the purple meaning "NC", and in
particular "bulk NC Mall purchase"

app/assets/stylesheets/items/sources.sass

@@ -62,11 +62,6 @@
 		.thumbnail-cell img
 			outline: 1px solid $soft-border-color
 
-		.actions-cell
-			button, a.button
-				/* Bootstrap's Purple 600 */
-				+awesome-button-color(#59359a)
-
 	tr[data-item-owned]
 		color: #aaa
 
@@ -119,6 +114,12 @@
 			text-decoration-line: underline
 			text-decoration-style: dotted
 
+	.actions-cell
+		button, a.button
+			&[data-action-kind=bulk-nc-mall]
+				/* Bootstrap's Purple 600 */
+				+awesome-button-color(#59359a)
+
 	&[data-complexity="high"]
 		width: 70%
 

app/views/items/sources.html.haml

@@ -21,7 +21,10 @@
 
 					%td.actions-cell
 						- if @items_needed[:nc_mall].present?
-							%button{onclick: "alert('Todo!')"}
+							%button{
+								onclick: "alert('Todo!')",
+								data: {"action-kind": "bulk-nc-mall"},
+							}
 								= cart_icon alt: ""
 								Buy all in NC Mall
 		%tbody
@@ -65,7 +68,10 @@
 						(~#{dyeworks_estimated_potions_cost_for @items_needed[:dyeworks]} NC)
 				%td.actions-cell
 					- if @items_needed[:dyeworks].present?
-						%button{onclick: "alert('Todo!')"}
+						%button{
+							onclick: "alert('Todo!')",
+							data: {"action-kind": "bulk-nc-mall"},
+						}
 							= cart_icon alt: ""
 							Buy all in NC Mall
 		%tbody