add req.query, add sapper.server(), remove unused code

test/apps/basics/src/server.js

@@ -1,9 +1,6 @@
-import polka from 'polka';
 import * as sapper from '@sapper/server';
-
 import { start } from '../../common.js';
 
-const app = polka()
-	.use(sapper.middleware())
+const server = sapper.server();
 
-start(app);
+start(server);