Fix #2 main container column on mobile and without TOC

inst/bulma/bulma.html

 
 <section class="section">
 <div class="container">
-  <div class="columns">
+  <div class="columns is-mobile">
     <div class="column $if(toc)$is-three-quarters-desktop is-full-tablet is-full-mobile$else$is-full$endif$">
       <div class="content" id="content-body">
         $if(author)$
         $body$
       </div>
     </div>
+    $if(toc)$
     <div class="column">
       <aside class="menu" id="toc-aside" data-gumshoe>
-        $if(toc)$$table-of-contents$$endif$
+        $table-of-contents$
       </aside>
     </div>
+    $endif$
   </div>
 </div>
 </section>