Use link instead of primary

docs/extensions.html

@@ -89,7 +89,7 @@ extensions:
   {% include navbar.html id="Extensions" %}
 </div>
 
-<section class="hero is-info">
+<section class="hero is-primary">
   <div class="hero-body">
     <div class="container">
       <div class="columns is-vcentered">