Use ko_deep_merge for incremental data removal

src/lib/data/custom.rb

@@ -15,10 +15,10 @@ module Charred
             data[:stocks].deep_merge!({ stock.key => stock })
           when ".lifepaths"
             contents = json_get(file)
-            data[:lifepaths].deep_merge!({ contents["stock"] => contents["settings"]})
+            data[:lifepaths].ko_deep_merge!({ contents["stock"] => contents["settings"]})
           when ".resources"
             contents = json_get(file)
-            data[:resources].deep_merge!({ contents["stock"] => contents["resources"]})
+            data[:resources].ko_deep_merge!({ contents["stock"] => contents["resources"]})
           end
         end
       }