Update default config for sapper

Author: CompuIves

packages/common/templates/sapper.js

@@ -1,14 +1,33 @@
 // @flow
+import configurations from './configuration';
+
 import Template from './template';
 import { decorateSelector } from '../theme';
 
+const extendedSandboxConfig = {
+  ...configurations.sandboxConfig,
+  getDefaultCode: () =>
+    JSON.stringify(
+      {
+        container: {
+          port: 3000,
+        },
+      },
+      null,
+      2
+    ),
+};
+
 export default new Template(
   'sapper',
   'Sapper',
   'https://sapper.svelte.technology/',
-  'sapper',
+  'github/sveltejs/sapper-template',
   decorateSelector(() => '#105E10'),
   {
+    extraConfigurations: {
+      '/sandbox.config.json': extendedSandboxConfig,
+    },
     isServer: true,
     mainFile: ['/src/routes/index.html'],
     showOnHomePage: false,