Don't move index.html

I found another difference between the source app and rewritten app. We've already normalized the *contents* of index.html between the two, but the *location* still differs.

packages/compat/src/compat-app-builder.ts

@@ -127,13 +127,13 @@ export class CompatAppBuilder {
     return ['.wasm', '.mjs', '.js', '.json', '.ts', '.hbs', '.hbs.js', '.gjs', '.gts'];
   }
 
-  private addEmberEntrypoints(htmlTreePath: string): string[] {
+  private addEmberEntrypoints(): string[] {
     let classicEntrypoints = ['index.html', 'tests/index.html'];
     if (!this.compatApp.shouldBuildTests) {
       classicEntrypoints.pop();
     }
     for (let entrypoint of classicEntrypoints) {
-      let sourcePath = join(htmlTreePath, entrypoint);
+      let sourcePath = join(this.compatApp.root, entrypoint);
       let rewrittenAppPath = join(this.root, entrypoint);
       writeFileSync(rewrittenAppPath, readFileSync(sourcePath));
     }
@@ -463,7 +463,7 @@ export class CompatAppBuilder {
     }
 
     let appFiles = this.updateAppJS(inputPaths.appJS);
-    let assetPaths = this.addEmberEntrypoints(inputPaths.htmlTree);
+    let assetPaths = this.addEmberEntrypoints();
 
     if (this.activeFastboot) {
       // when using fastboot, our own package.json needs to be in the output so fastboot can read it.
@@ -741,7 +741,6 @@ function addCachablePlugin(babelConfig: TransformOptions) {
 
 interface TreeNames {
   appJS: BroccoliNode;
-  htmlTree: BroccoliNode;
   publicTree: BroccoliNode | undefined;
   configTree: BroccoliNode;
 }

packages/compat/src/compat-app.ts

@@ -96,10 +96,6 @@ export default class CompatApp {
     return require(resolve.sync(specifier, { basedir: this.emberCLILocation }));
   }
 
-  private get configReplace() {
-    return this.requireFromEmberCLI('broccoli-config-replace');
-  }
-
   private get configLoader() {
     return this.requireFromEmberCLI('broccoli-config-loader');
   }
@@ -184,45 +180,6 @@ export default class CompatApp {
     };
   }
 
-  private get htmlTree() {
-    if (this.legacyEmberAppInstance.tests) {
-      return mergeTrees([this.indexTree, this.testIndexTree]);
-    } else {
-      return this.indexTree;
-    }
-  }
-
-  private get indexTree() {
-    let indexFilePath = this.legacyEmberAppInstance.options.outputPaths.app.html;
-    let index = buildFunnel(this.legacyEmberAppInstance.trees.app, {
-      allowEmpty: true,
-      include: [`index.html`],
-      getDestinationPath: () => indexFilePath,
-      annotation: 'app/index.html',
-    });
-    return new this.configReplace(index, this.configTree, {
-      configPath: join('environments', `${this.legacyEmberAppInstance.env}.json`),
-      files: [indexFilePath],
-      patterns: this.filteredPatternsByContentFor.others,
-      annotation: 'ConfigReplace/indexTree',
-    });
-  }
-
-  private get testIndexTree() {
-    let index = buildFunnel(this.legacyEmberAppInstance.trees.tests, {
-      allowEmpty: true,
-      include: [`index.html`],
-      destDir: 'tests',
-      annotation: 'tests/index.html',
-    });
-    return new this.configReplace(index, this.configTree, {
-      configPath: join('environments', `test.json`),
-      files: ['tests/index.html'],
-      patterns: this.filteredPatternsByContentFor.others,
-      annotation: 'ConfigReplace/testIndexTree',
-    });
-  }
-
   @Memoize()
   babelConfig(): TransformOptions {
     // this finds all the built-in babel configuration that comes with ember-cli-babel
@@ -727,7 +684,6 @@ export default class CompatApp {
 
     return {
       appJS: this.processAppJS().appJS,
-      htmlTree: this.htmlTree,
       publicTree,
       configTree,
       contentForTree,