Add local test data, implement [id].tsx for approval workflows

src/demo/approval_workflows.json

@@ -1 +1,42 @@
-[]
+[
+    {
+        "id": "local-test-id-1",
+        "name": "name-1",
+        "module": "reading",
+        "status": "approved",
+        "approvers": "prof-1",
+        "step": "Concluded"
+    },
+    {
+        "id": "local-test-id-2",
+        "name": "name-2",
+        "module": "reading",
+        "status": "pending",
+        "approvers": "prof-2",
+        "step": "Concluded"
+    },
+    {
+        "id": "local-test-id-3",
+        "name": "name-3",
+        "module": "listening",
+        "status": "rejected",
+        "approvers": "prof-3",
+        "step": "Concluded"
+    },
+    {
+        "id": "local-test-id-4",
+        "name": "name-4",
+        "module": "writing",
+        "status": "approved",
+        "approvers": "prof-4",
+        "step": "Concluded"
+    },
+    {
+        "id": "local-test-id-5",
+        "name": "name-5",
+        "module": "reading",
+        "status": "approved",
+        "approvers": "prof-5",
+        "step": "Concluded"
+    }
+]