Remove playground landing page

index.js

@@ -1,5 +1,4 @@
 import {ApolloServer, gql} from 'apollo-server';
-import {ApolloServerPluginLandingPageGraphQLPlayground} from 'apollo-server-core';
 import {buildSubgraphSchema} from '@apollo/subgraph';
 import {readFileSync} from 'fs';
 import {resolvers} from './resolvers.js';
@@ -8,8 +7,7 @@ const typeDefs = gql(readFileSync('./schema.graphql', 'utf-8'));
 
 const server = new ApolloServer({
   schema: buildSubgraphSchema({typeDefs, resolvers}),
-  introspection: true,
-  plugins: [ApolloServerPluginLandingPageGraphQLPlayground()]
+  introspection: true
 });
 
 server.listen({port: process.env.PORT || 4000}).then(({url}) => {