chore(client): update sctucture after switching to vite

supervisord.conf

@@ -32,11 +32,11 @@ startretries=5
 
 [program:client]
 environment=
-    REACT_APP_WEBSOCKET_PROTOCOL=ws,
-    REACT_APP_HTTP_PROTOCOL=http,
-    REACT_APP_API_URL=localhost:8000,
-    REACT_APP_URL=localhost:3000
-command=bash -c 'cd client; npm run build; serve -s build'
+    VITE_APP_WEBSOCKET_PROTOCOL=ws,
+    VITE_APP_HTTP_PROTOCOL=http,
+    VITE_APP_API_URL=localhost:8000,
+    VITE_APP_URL=localhost:3000
+command=bash -c 'cd client; npm run build; npm run preview'
 numprocs=1
 process_name=node-%(process_num)d
 stdout_logfile=client.out.log