fix: remove redundant role="section" from <section> element

Author: adamjohnson

templates/index.html

@@ -84,7 +84,7 @@ <h2>All projects</h2>
         </div>
     </main>
 
-    <section id="contribute" role="section" aria-labelledby="h-contributing">
+    <section id="contribute" aria-labelledby="h-contributing">
         <div class="container">
             <h2 id="h-contributing" class="visually-hidden">Contributing</h2>
             <div class="grid sm-two-columns">