add entry for Gradle plugin to topbar nav

Author: mojavelinux

src/partials/header-content.hbs

@@ -54,8 +54,6 @@
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'diagram-extension::index.adoc')}}}">Asciidoctor Diagram <small>Ruby</small></a>
             {{!--
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'kroki-extension::index.adoc')}}}">Asciidoctor Kroki <small>JavaScript</small></a>
-            --}}
-            {{!--
             <a class="navbar-item" href="#">Asciidoctor Chart</a>
             <a class="navbar-item" href="#">Asciidoctor bibtex</a>
             <div class="navbar-item">Feature Adapters</div>
@@ -69,9 +67,7 @@
           <div class="navbar-dropdown is-right">
             <div class="navbar-item">Build Automation</div>
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'maven-tools::index.adoc')}}}">Maven Tools <small>Java</small></a>
-            {{!--
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'gradle-plugin::index.adoc')}}}">Gradle Plugin <small>Java</small></a>
-            --}}
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'asciidoclet::index.adoc')}}}">Asciidoclet <small>Java</small></a>
             <hr class="navbar-divider">
             <div class="navbar-item">Text Editors / Viewers</div>