Change back GQL endpoint for gateway server to /graphql (#39)

packages/gateway-server/src/gateway.ts

@@ -52,7 +52,6 @@ async function makeGatewaySchema () {
 export const gatewayApp = createYoga({
   schema: makeGatewaySchema(),
   maskedErrors: false,
-  graphqlEndpoint: '/',
   graphiql: {
     title: 'Azimuth Watchers',
     defaultQuery: `#

packages/gateway-server/src/index.ts

@@ -10,4 +10,4 @@ import { gatewayApp } from './gateway';
 const log = debug('vulcanize:server');
 
 const server = createServer(gatewayApp);
-server.listen(4000, () => log('gateway running at http://localhost:4000'));
+server.listen(4000, () => log('gateway running at http://localhost:4000/graphql'));