docs(webpack): remove barrel

closes #1389

public/docs/_examples/webpack/ts/src/app/index.ts

@@ -1,2 +0,0 @@
-// #docregion
-export * from './app.component.ts';

public/docs/_examples/webpack/ts/src/main.ts

@@ -2,7 +2,7 @@
 import { bootstrap } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';
 
-import { AppComponent } from './app';
+import { AppComponent } from './app/app.component';
 
 // #docregion enable-prod
 if (process.env.ENV === 'production') {

public/docs/ts/latest/guide/webpack.jade

@@ -412,14 +412,12 @@ code-example(format="").
   `webpack/ts/src/app/app.component.ts,
   webpack/ts/src/app/app.component.html,
   webpack/ts/src/app/app.component.css,
-  webpack/ts/src/app/app.component.spec.ts,
+  webpack/ts/src/app/app.component.spec.ts`,
-  webpack/ts/src/app/index.ts`,
   null,
   `src/app/app.component.ts,
   src/app/app.component.html,
   src/app/app.component.css,
-  src/app/app.component.spec.ts,
+  src/app/app.component.spec.ts`
-  src/app/index.ts`
 )
 
 +makeTabs(
@@ -442,15 +440,12 @@ code-example(format="").
   * The `AppComponent` in `app.component.ts` imports the application-wide css with a simple `import` statement.
   
   * The `AppComponent` itself has its own html template and css files which we load with the `require()` method
-  supplied by Webpack. Webpack stashes those component-scoped files in the `app.ts` bundle too.
+  supplied by Webpack. Webpack stashes those component-scoped files in the `app.js` bundle too.
   
   * The `vendor.ts` consists of vendor dependency `import` statements that drive the `vendor.js` bundle.
   The application imports these modules too; they'd be duplicated in the `app.js` bundle
   if the `CommonsChunkPlugin` hadn't detected the overlap and removed them from `app.js`.
 
-// WHAT GOOD IS THIS?
-  * We coded our app feature as a [barrel](../glossary.html#barrel).
-
 <a id="conclusions"></a>
 :marked
   ## Conclusions