docs(tutorial/step-0): add target="_blank" to open app in new page

Closes angular#5145

Author: programistka

docs/content/tutorial/step_00.ngdoc

@@ -26,7 +26,7 @@ angular-seed, and run the application in the browser.
             <ol>
               <li>In a <i>separate</i> terminal tab or window, run <code>node ./scripts/web-server.js</code> to start the web server.</li>
               <li>Open a browser window for the app and navigate to <a
-              href="http://localhost:8000/app/index.html">http://localhost:8000/app/index.html</a></li>
+              href="http://localhost:8000/app/index.html" target="_blank">`http://localhost:8000/app/index.html`</a></li>
             </ol>
           </li>
           <li><b>For other http servers:</b>
@@ -54,7 +54,7 @@ angular-seed, and run the application in the browser.
           <li><b>For node.js users:</b>
             <ol>
               <li>In a <i>separate</i> terminal tab or window, run <code>node scripts\web-server.js</code> to start the web server.</li>
-              <li>Open a browser window for the app and navigate to <a href="http://localhost:8000/app/index.html">http://localhost:8000/app/index.html</a></li>
+              <li>Open a browser window for the app and navigate to <a href="http://localhost:8000/app/index.html" target="_blank">`http://localhost:8000/app/index.html`</a></li>
             </ol>
           </li>
           <li><b>For other http servers:</b>