Show crafting plan button only when craftable

src/client/site/item_page/item_page_controller.coffee

@@ -102,6 +102,7 @@ module.exports = class ItemPageController extends PageController
             enterFeedback: @_enterFeedback
 
         @$aboutImage         = @$('.about img')
+        @$craftingPlanButton = @$('.button.craftingPlan')
         @$name               = @$('.about .title')
         @$officialLink       = @$('.about a.officialLink')
         @$sourceModLink      = @$('.about a.sourceMod')
@@ -135,6 +136,11 @@ module.exports = class ItemPageController extends PageController
             else
                 @hide @$aboutLinks
 
+            if @model.item.isCraftable
+                @show @$craftingPlanButton
+            else
+                @hide @$craftingPlanButton
+
             @show()
         else
             @hide()