Add Workflow and Partition Endpoint Playgrounds (#652)

Author: Paul-Cornell

api-reference/partition/pipeline-1.mdx

@@ -198,7 +198,11 @@
                 ]
               },
               "api-reference/workflow/workflows",
-              "api-reference/workflow/jobs"
+              "api-reference/workflow/jobs",
+              {
+                "group": "Endpoint Playground",
+                "openapi": "https://platform.unstructuredapp.io/openapi.json"
+              }
             ]
           },
           {
@@ -221,7 +225,10 @@
               "api-reference/partition/get-chunked-elements",
               "api-reference/partition/transform-schemas",
               "api-reference/partition/generate-schema",
-              "api-reference/partition/pipeline-1"
+              {
+                "group": "Endpoint Playground",
+                "openapi": "https://api.unstructuredapp.io/general/openapi.json"
+              }
             ]
           },
           {