diff --git a/playground/simple-example/hello_world.bpmn b/playground/simple-example/hello_world.bpmn
deleted file mode 100644
index a37dd6cd..00000000
--- a/playground/simple-example/hello_world.bpmn
+++ /dev/null
@@ -1,56 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:spiffworkflow="http://spiffworkflow.org/bpmn/schema/1.0/core" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_96f6665" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.0.0-dev">
-  <bpmn:process id="Process_tplw9di" isExecutable="true">
-    <bpmn:startEvent id="StartEvent_1">
-      <bpmn:outgoing>Flow_0k7z31f</bpmn:outgoing>
-    </bpmn:startEvent>
-    <bpmn:sequenceFlow id="Flow_0k7z31f" sourceRef="StartEvent_1" targetRef="Activity_15zssoa" />
-    <bpmn:scriptTask id="Activity_15zssoa" name="Set Name">
-      <bpmn:incoming>Flow_0k7z31f</bpmn:incoming>
-      <bpmn:outgoing>Flow_1ditr0b</bpmn:outgoing>
-      <bpmn:script>my_name = "World"</bpmn:script>
-    </bpmn:scriptTask>
-    <bpmn:sequenceFlow id="Flow_1ditr0b" sourceRef="Activity_15zssoa" targetRef="Activity_0xc4pa4" />
-    <bpmn:manualTask id="Activity_0xc4pa4" name="Display Message">
-      <bpmn:extensionElements>
-        <spiffworkflow:instructionsForEndUser>Hello {{my_name}}!
---------------------------
-Welcome to SpiffWorkflow!</spiffworkflow:instructionsForEndUser>
-      </bpmn:extensionElements>
-      <bpmn:incoming>Flow_1ditr0b</bpmn:incoming>
-      <bpmn:outgoing>Flow_1bp1ryc</bpmn:outgoing>
-    </bpmn:manualTask>
-    <bpmn:endEvent id="Event_00owh7w">
-      <bpmn:incoming>Flow_1bp1ryc</bpmn:incoming>
-    </bpmn:endEvent>
-    <bpmn:sequenceFlow id="Flow_1bp1ryc" sourceRef="Activity_0xc4pa4" targetRef="Event_00owh7w" />
-  </bpmn:process>
-  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
-    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_tplw9di">
-      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
-        <dc:Bounds x="179" y="159" width="36" height="36" />
-      </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Activity_0vnd7ff_di" bpmnElement="Activity_15zssoa">
-        <dc:Bounds x="270" y="137" width="100" height="80" />
-      </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Activity_1qlipg8_di" bpmnElement="Activity_0xc4pa4">
-        <dc:Bounds x="430" y="137" width="100" height="80" />
-      </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Event_00owh7w_di" bpmnElement="Event_00owh7w">
-        <dc:Bounds x="592" y="159" width="36" height="36" />
-      </bpmndi:BPMNShape>
-      <bpmndi:BPMNEdge id="Flow_0k7z31f_di" bpmnElement="Flow_0k7z31f">
-        <di:waypoint x="215" y="177" />
-        <di:waypoint x="270" y="177" />
-      </bpmndi:BPMNEdge>
-      <bpmndi:BPMNEdge id="Flow_1ditr0b_di" bpmnElement="Flow_1ditr0b">
-        <di:waypoint x="370" y="177" />
-        <di:waypoint x="430" y="177" />
-      </bpmndi:BPMNEdge>
-      <bpmndi:BPMNEdge id="Flow_1bp1ryc_di" bpmnElement="Flow_1bp1ryc">
-        <di:waypoint x="530" y="177" />
-        <di:waypoint x="592" y="177" />
-      </bpmndi:BPMNEdge>
-    </bpmndi:BPMNPlane>
-  </bpmndi:BPMNDiagram>
-</bpmn:definitions>