layouts: Add docs left nav with each major release link

Author: zemian

_layouts/docs_page.html

@@ -16,7 +16,14 @@
     <div class="col-xs-6 col-sm-3 sidebar-offcanvas" id="sidebar" role="navigation">
         <ul class="nav">
           <li id="site_mnu_docs_home" class="submenu"><a href="/documentation/">Documentation Home</a></li>
-          <li id="site_mnu_docs_downloads" class="submenu"><a href="/downloads/">Downloads</a></li>
+
+          <li id="site_mnu_docs_snapshot" class="submenu"><a href="/documentation/{{ asciidoc_attributes.quartz-version }}">Quartz {{ asciidoc_attributes.quartz-version }}</a></li>
+          <li id="site_mnu_docs_snapshot-23x" class="submenu"><a href="/documentation/{{ asciidoc_attributes.quartz-version-23x }}">Quartz {{ asciidoc_attributes.quartz-version-23x }}</a></li>
+
+          <li id="site_mnu_docs_2.2.2" class="submenu"><a href="/documentation/quartz-2.2.2">Quartz 2.2.2</a></li>
+          <li id="site_mnu_docs_2.1.7" class="submenu"><a href="/documentation/quartz-2.1.7">Quartz 2.1.7</a></li>
+          <li id="site_mnu_docs_2.0.2" class="submenu"><a href="/documentation/quartz-2.0.2">Quartz 2.0.2</a></li>
+          <li id="site_mnu_docs_1.8.6" class="submenu"><a href="/documentation/quartz-1.8.6">Quartz 1.8.6</a></li>
         </ul>
     </div>