Fix theme previews

Author: leviarista

partials/toolbox/presets.html

@@ -5,9 +5,9 @@
         <div role="button" class="theme-button theme-button-white">
             Create my own
         </div>
-        <a href="https://github.com/leviarista/github-profile-header-generator" target="_blank"
+        <!-- <a href="https://github.com/leviarista/github-profile-header-generator" target="_blank"
             rel="noopener noreferrer" class="theme-button theme-button-white">
             Upload theme
-        </a>
+        </a> -->
     </div>
 </div>