Cows and Ghosts (but no cow ghosts) (#8052)

* feat(content): Mystery Items and Ghost Potions

* fix(news): better cow position

* fix(test): update for season

website/common/script/content/hatching-potions.js

@@ -54,6 +54,9 @@ let premium = {
     text: t('hatchingPotionSpooky'),
     limited: true,
     _season: 'fall',
+    canBuy () {
+      return true;
+    },
   },
   Peppermint: {
     value: 2,
@@ -73,6 +76,15 @@ let premium = {
     limited: true,
     _season: 'summer',
   },
+  Ghost: {
+    value: 2,
+    text: t('hatchingPotionGhost'),
+    limited: true,
+    _season: 'fall',
+    canBuy () {
+      return true;
+    },
+  },
 };
 
 each(drops, (pot, key) => {