Improve literature heading hierarchy with section H2 and document H3 titles

views/literature.ejs

@@ -13,10 +13,11 @@
 
   <section class="section">
     <div class="container docs-list">
+      <h2>Document library</h2>
       <% (config.literature || []).forEach((doc) => { %>
       <article class="doc-row reveal" data-reveal>
         <div>
-          <h2><%= doc.title %></h2>
+          <h3><%= doc.title %></h3>
           <p>Reference document</p>
         </div>
         <a href="<%= doc.url %>" target="_blank" rel="noopener noreferrer" class="btn btn-primary">Open PDF</a>