feat(aio): support hiding the copy button on code-examole components

In the API docs there are occasions where we do not wish the code snippet
to have a copy button. This commit supports that by providing a new `hideCopy`
attribute.

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

@@ -31,7 +31,7 @@ const defaultLineNumsCount = 10; // by default, show linenums over this number
   selector: 'aio-code',
   template: `
     <pre class="prettyprint lang-{{language}}">
-      <button *ngIf="code" class="material-icons copy-button" (click)="doCopy()">content_copy</button>
+      <button *ngIf="!hideCopy" class="material-icons copy-button" (click)="doCopy()">content_copy</button>
       <code class="animated fadeIn" #codeContainer></code>
     </pre>
     `
@@ -72,6 +72,12 @@ export class CodeComponent implements OnChanges {
   @Input()
   region: string;
 
+  /**
+   * set to true if the copy button is not to be shown
+   */
+  @Input()
+  hideCopy: boolean;
+
   /**
    * The element in the template that will display the formatted code
    */