删除无用代码并且新增流程图相关内容

oj/routing.py

@@ -5,9 +5,11 @@ WebSocket URL Configuration for oj project.
 from django.urls import path
 from submission.consumers import SubmissionConsumer
 from conf.consumers import ConfigConsumer
+from flowchart.consumers import FlowchartConsumer
 
 websocket_urlpatterns = [
     path("ws/submission/", SubmissionConsumer.as_asgi()),
     path("ws/config/", ConfigConsumer.as_asgi()),
+    path("ws/flowchart/", FlowchartConsumer.as_asgi()),
 ]