fix(footer): extra w in www.angular.io (#217)

just use https://angular.io since that is where www.angular.io goes

Author: Splaktar

src/app/shared/footer/footer.html

@@ -8,7 +8,7 @@
 
     <div class="docs-footer-links">
       <ul>
-        <li> <a href="https://wwww.angular.io">Learn Angular</a> </li>
+        <li> <a href="https://angular.io">Learn Angular</a> </li>
       </ul>
     </div>