move the index.html into the root of the blueprint

index.js

@@ -3,6 +3,7 @@ const fs = require('fs');
 const { join } = require('path');
 const emberCliUpdate = require('./lib/ember-cli-update');
 const copyWithTemplate = require('./lib/copy-with-template');
+const { rm } = require('fs/promises');
 
 const appBlueprint = Blueprint.lookup('app');
 
@@ -57,6 +58,12 @@ module.exports = {
   },
 
   async afterInstall(options) {
+    const filesToDelete = ['app/index.html'];
+
+    for (let file of filesToDelete) {
+      await rm(join(options.target, file));
+    }
+
     // there doesn't seem to be a way to tell ember-cli to not prompt to override files that were added in the beforeInstall
     // so I'm just copying a few over at this stage
     copyWithTemplate(

tests/default.test.mjs

@@ -3,6 +3,7 @@ import { join } from 'path';
 import tmp from 'tmp-promise';
 import { execa } from 'execa';
 import copyWithTemplate from '../lib/copy-with-template';
+import { existsSync } from 'fs';
 
 const blueprintPath = join(__dirname, '..');
 const appName = 'fancy-app-in-test';
@@ -37,6 +38,17 @@ describe('basic functionality', function () {
     return tmpDir.cleanup();
   });
 
+  it('verify files', async function () {
+    expect(
+      !existsSync(join(tmpDir.path, 'app/index.html')),
+      'the app index.html has been removed',
+    );
+    expect(
+      existsSync(join(tmpDir.path, 'index.html')),
+      'the root index.html has been added',
+    );
+  });
+
   it('successfully builds', async function () {
     let result = await execa('pnpm', ['build'], {
       cwd: join(tmpDir.path, appName),