Update default.html

Drop paid membership model links.

Author: kleinerm

_layouts/default.html

@@ -40,7 +40,6 @@ <h1><a href="/">Psychtoolbox-3</a></h1>
     <ul>
       <li><a href=https://peterscarfe.com/ptbtutorials.html>Beginner Tutorial</a></li>
       <li><a href={{ site.baseurl }}/docs/Psychtoolbox.html>Function Reference</a></li>
-      <li><a href=https://www.psychtoolbox.net/license-key>Paid Support</a></li>
       <li><a href={{ site.baseurl }}/forum.html>Community Forum</a></li>
       <li><a href=https://github.com/Psychtoolbox-3/Psychtoolbox-3/wiki/FAQ#general-faqs>General FAQ</a></li>
       <li><a href=https://github.com/Psychtoolbox-3/Psychtoolbox-3/wiki/FAQ#faqs-for-software-license-keys>Software License keys FAQ</a></li>
@@ -61,7 +60,7 @@ <h1><a href="/">Psychtoolbox-3</a></h1>
   </nav>
 
   <ul class=buttons>
-    <li><a href=https://www.psychtoolbox.net/license-key>Paid <strong>Support</strong></a></li>
+<!--    <li><a href=https://www.psychtoolbox.net/license-key>Paid <strong>Support</strong></a></li>-->
     <li><a href={{ site.baseurl }}/forum.html>Community <strong>Forum</strong></a></li>
 <!--    <li><a href=https://raw.github.com/Psychtoolbox-3/Psychtoolbox-3/master/Psychtoolbox/DownloadPsychtoolbox.m>Automatic <strong>Installer</strong></a></li>-->
     <li><a href=https://github.com/Psychtoolbox-3/Psychtoolbox-3/releases/latest/download/3.0.21.0.zip>Download PTB<strong>ZIP File</strong></a></li>