remove unused HTML from header content [skip ci]

Author: mojavelinux

src/partials/header-content.hbs

@@ -37,14 +37,8 @@
           </div>
         </div>
         <div class="navbar-item has-dropdown is-hoverable">
-          {{!--
-          <div class="navbar-link">Conversion</div>
-          --}}
           <div class="navbar-link">Processing</div>
           <div class="navbar-dropdown">
-            {{!--
-            <div class="navbar-item">Core</div>
-            --}}
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'asciidoctor::index.adoc')}}}">Asciidoctor <small>Ruby</small></a>
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'asciidoctor.js::index.adoc')}}}">Asciidoctor.js <small>JavaScript</small></a>
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'asciidoctorj::index.adoc')}}}">AsciidoctorJ <small>Java</small></a>