Remove design element colours

This isn't actually exposed anywhere publically at the moment, so we can
remove it until it can be scoped properly. There are complications with
the way it works currently since it only contains design element colours
from Print Service OR knit colours from Cloudknit and not embellishment
colours.

apiary_v2.apib

@@ -2268,34 +2268,6 @@ order.
                     "units": "mm",
                     "origin_roster_field_key": null
                   }
-                ],
-                "design_element_colours": [
-                  {
-                    "cmyk": [
-                      0.7,
-                      0.7,
-                      0.7,
-                      1.0
-                    ],
-                    "colour_name": "Noir",
-                    "display_colour": "#000000",
-                    "is_spot_colour": false,
-                    "brand_reference": "Noir",
-                    "factory_reference": "blk-13"
-                  },
-                  {
-                    "cmyk": [
-                      1.0,
-                      0.0,
-                      0.9,
-                      0.2
-                    ],
-                    "colour_name": "Lime Green",
-                    "display_colour": "#00cc14",
-                    "is_spot_colour": false,
-                    "brand_reference": "Lime Green",
-                    "factory_reference": "grn-344"
-                  }
                 ]
               },
               // ...remaining jobs here
@@ -2389,34 +2361,6 @@ endpoint provides:
                 "units": "mm",
                 "origin_roster_field_key": null
               }
-            ],
-            "design_element_colours": [
-              {
-                "cmyk": [
-                  0.7,
-                  0.7,
-                  0.7,
-                  1.0
-                ],
-                "colour_name": "Noir",
-                "display_colour": "#000000",
-                "is_spot_colour": false,
-                "brand_reference": "Noir",
-                "factory_reference": "blk-13"
-              },
-              {
-                "cmyk": [
-                  1.0,
-                  0.0,
-                  0.9,
-                  0.2
-                ],
-                "colour_name": "Lime Green",
-                "display_colour": "#00cc14",
-                "is_spot_colour": false,
-                "brand_reference": "Lime Green",
-                "factory_reference": "grn-344"
-              }
             ]
           }