Add DOCS menu in top section (#1586)

Author: eksperimental

_includes/top.html

@@ -36,6 +36,7 @@
         <ul id="menu-primary-items">
           <li class="menu-item home"><a class="spec" href="/">Home</a></li>
           <li class="menu-item install"><a class="spec" href="/install.html">Install</a></li>
+          <li class="menu-item docs"><a class="spec" href="/docs.html">Docs</a></li>
           <li class="menu-item learning"><a class="spec" href="/learning.html">Learning</a></li>
           <li class="menu-item getting-started"><a class="spec" href="/getting-started/introduction.html">Guides</a></li>
           <li class="menu-item cases"><a class="spec" href="/cases.html">Cases</a></li>