refactor(aio): move content-related images to content/images/

aio/src/app/embedded/contributor/contributor.component.ts

@@ -9,7 +9,7 @@ import { Contributor } from './contributors.model';
 
         <div class="card-front" (click)="flipCard(person)">
             <h3>{{person.name}}</h3>
-            
+
             <div *ngIf="person.picture" class="contributor-image" [style.background-image]="'url('+pictureBase+person.picture+')'">
                 <div class="contributor-info">
                     <button>

aio/src/app/embedded/live-example/live-example.component.ts

@@ -3,7 +3,7 @@ import { Component, ElementRef, HostListener, Input, OnInit, AfterViewInit, View
 import { Location } from '@angular/common';
 
 const defaultPlnkrImg = 'plunker/placeholder.png';
-const imageBase  = 'assets/images/';
+const imageBase  = 'content/images/';
 const liveExampleBase = 'content/live-examples/';
 const zipBase = 'content/zips/';