docs(aio): doc guide tweaks (GS thru Components)

Working through obvious non-image content defects, from top of menu (Getting Started) through Fundamentals/Components.

aio/content/examples/component-interaction/src/main.ts

@@ -0,0 +1,5 @@
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+
+platformBrowserDynamic().bootstrapModule(AppModule);