Revert "Refactor Shipments API & JS."

This was acciddentally committed. Original is 5224bf294163b168fd1ee5cc760187ec9d83c26f

This reverts commit 715311656d14f5ff7cfe9e837f8998721496c8f4.
Revert "Add shipments API back under orders"

This reverts commit ab17831db1f1f2c8a7fca78dda97e9f7e13dbeef.