Update materials to say 'kit' in wording

Author: Matthew McCullough

index.html

@@ -1,8 +1,8 @@
 ---
 layout: bare
 theme: home
-title: GitHub Training Materials
-description: Open source materials for teaching GitHub and Git skills.
+title: GitHub Training Kit
+description: Open source kit for teaching GitHub and Git skills.
 ---
 
 <section class="colorful see-thru navigation" id="floating-nav">
@@ -111,8 +111,8 @@ <h2>Community contributions</h2>
       Just fork the repository, make your changes, and submit a Pull Request.
     </p>
 
-    <a class="big-link" href="https://github.com/github/training-materials/">
-      Head over to the github/training-materials repository.
+    <a class="big-link" href="https://github.com/github/training-kit">
+      Head over to the github/training-kit repository.
     </a>
   </div>
 </section>