Comment out student developer pack link

Comment out the 'Get Student Developer Pack' link in the header.

Author: davideborgioli

_includes/header.html

@@ -12,6 +12,6 @@ <h1 class="project-name">{{ site.title | default: site.github.repository_name }}
 <!--  	<a href="{{ site.baseurl }}{% link faq.md %}" class="btn">FAQ</a>
     <a href="{{ site.baseurl }}{% link licensing.md %}" class="btn">Licensing</a> -->
   	<a href="{{ site.baseurl }}{% link join_organization.md %}" class="btn">Join Organization</a>
-    <a href="{{ site.baseurl }}{% link students.md %}" class="btn">Get Student Developer Pack</a> 
+<!--    <a href="{{ site.baseurl }}{% link students.md %}" class="btn">Get Student Developer Pack</a> -->
     <a href="{{ site.baseurl }}{% link hpc.md %}" class="btn">Request Computing Resources</a>