Rebrand the "Item Getting Guide" as "Shopping List"

Two reasons for this new title:
1. The pitch for "Get these items!" is weaker, now that we're not
   getting the power-user integrations we'd planned around.
2. I literally only just thought of it now!

app/javascript/wardrobe-2020/WardrobePage/ItemsPanel.js

@@ -280,8 +280,8 @@ function ItemZoneGroupSkeleton({ itemCount }) {
 
 /**
  * GetTheseItemsButton shows the "Get these items!" button, to link to the
- * Item Getting Guide page for the items in this outfit. If there are no items
- * being worn, this is disabled.
+ * Shopping List page for the items in this outfit. If there are no items being
+ * worn, this is disabled.
  */
 function GetTheseItemsButton({ outfitState }) {
   const [searchParams] = useSearchParams();
@@ -305,13 +305,13 @@ function GetTheseItemsButton({ outfitState }) {
 
   return (
     <Tooltip
-      label="Get these items!"
+      label="Shopping list"
       placement="top"
       background="purple.500"
       color="white"
     >
       <IconButton
-        aria-label="Get these items!"
+        aria-label="Shopping list"
         as={isDisabled ? "button" : "a"}
         href={isDisabled ? undefined : targetUrl}
         target={isDisabled ? undefined : "_blank"}

app/views/items/sources.html.haml

@@ -1,5 +1,9 @@
-- title "Item Getting Guide"
-%h1#title Item Getting Guide
+- title "Shopping List"
+%h1#title Shopping List
+
+:markdown
+	Here's a custom shopping list for exactly the items in your outfit!
+	Have fun bringing your design to life!!
 
 - if @items[:nc_mall].present?
 	%h2 NC Mall items