add link to Asciidoctor Reducer from navbar

Author: mojavelinux

src/partials/header-content.hbs

@@ -50,6 +50,9 @@
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'epub3-converter::index.adoc')}}}">EPUB3 <small>Ruby</small></a>
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'reveal.js-converter::index.adoc')}}}">reveal.js <small>Ruby, JavaScript</small></a>
             <hr class="navbar-divider">
+            <div class="navbar-item">Source Compilers</div>
+            <a class="navbar-item" href="https://github.com/asciidoctor/asciidoctor-reducer" target="_blank" rel="noopener">Reducer <small>Ruby, JavaScript</small></a>
+            <hr class="navbar-divider">
             <div class="navbar-item">Extended Syntax</div>
             <a class="navbar-item" href="{{{relativize (resolvePageURL 'diagram-extension::index.adoc')}}}">Asciidoctor Diagram <small>Ruby</small></a>
             {{!--