switch to plantuml

src/App.tsx

@@ -36,7 +36,7 @@ const initialNodes: Node[] = [
   {
     id: 'config-1',
     position: { x: 50, y: 50 },
-    data: { yaml: "# example:\nmessage: Hello from config" },
+    data: { plantuml: '@startuml\nactor User\nparticipant "Render" as R\nUser -> R : config\n@enduml\n' },
     type: 'config',
   },
   {
@@ -116,7 +116,7 @@ export default function App() {
         function: 'function',
       }
       const dataMap: Record<string, any> = {
-        config: { yaml: '# Enter YAML here\n', title: `config-${id}` },
+        config: { plantuml: '@startuml\n\n@enduml\n', title: `config-${id}` },
         render: {},
         variable: { value: '', valueType: 'string' },
         function: { body: '// args[0], args[1], ...\nreturn args[0];' },