Removed nested main elements on specific products

Main landmark must not be contained in another landmark

https://dequeuniversity.com/rules/axe/4.1/landmark-main-is-top-level

Author: barrymcgee

includes/article.html

@@ -1,4 +1,4 @@
-<main class="container-xl px-3 px-md-6 my-4 my-lg-4 d-xl-flex">
+<div class="container-xl px-3 px-md-6 my-4 my-lg-4 d-xl-flex">
   <article class="markdown-body width-full">
     <div class="d-lg-flex flex-justify-between">
       <div class="d-block d-lg-none">{% include article-version-switcher %}</div>
@@ -70,4 +70,4 @@ <h2 id="in-this-article" class="f5 mb-2"><a class="link-gray-dark" href="#in-thi
       {% unless page.hidden %}{% include contribution %}{% endunless %}
     </div>
   </article>
-</main>
+</div>