docs(index): correct link to the www.ngeurope.org site

Closes #139
Closes angular/angular.js#9901

Author: pkozlowski-opensource

src/index.html

@@ -220,7 +220,7 @@ <h4 class="video-item-heading">{{ video.title }}</h4>
         <a href="https://www.youtube.com/channel/UCEGUP3TJJfMsEM_1y8iviSQ" target="_blank" class="btn btn-primary btn-large" rel="nofollow"> 
           view all videos
         </a>
-        <a href="http://www.ng-europe.org/" target="_blank" class="btn btn-large"  rel="nofollow">
+        <a href="http://www.ngeurope.org/" target="_blank" class="btn btn-large"  rel="nofollow">
           www.ngeurope.org
         </a>
       </div>