chore: remove angulardart.org link from footer

closes #1034

Author: kwalrath

public/_includes/_footer.jade

@@ -19,7 +19,6 @@ else
       ul.text-body
         li <a href="/"> Angular 2.0</a>
         li <a href="https://angularjs.org/"> Angular 1 for JS</a>
-        li <a href="https://angulardart.org/"> Angular 1 for Dart</a>
         li <a href="https://material.angularjs.org"> Angular Material</a>
         li <a href="https://www.firebase.com/docs/web/libraries/angular/"> AngularFire</a>
 
@@ -54,4 +53,4 @@ else
   footer(class="background-steel")
     small.text-caption Powered by Google ©2010-2016. Code licensed under an <a href="/license" class="text-snow">MIT-style License</a>. Documentation licensed under <a class="text-snow" href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.
     a(aria-label="View Style Guide" href=styleguide title="Style Guide" class="styleguide-trigger text-snow" md-button)
-      span.icon-favorite
+      span.icon-favorite