feat: add tags to post pages (#193)

layouts/partials/menu.html

@@ -10,6 +10,22 @@
         {{ end }}
     </section>
 
+    {{ if and (in (slice "posts" "tags") .Section) (default false .Site.Params.GeekdocTagsToMenu) }}
+    <section class="gdoc-nav--tags">
+        <h2>Tags</h2>
+        <ul class="gdoc-nav__list">
+            {{ $currentPage := .RelPermalink }}
+            {{ range $name, $taxonomy := .Site.Taxonomies.tags }}
+            {{ with $.Site.GetPage (printf "/tags/%s" $name) }}
+            <li>
+                <a class="gdoc-nav__entry {{ if eq $currentPage .RelPermalink }} is-active {{ end }}" href="{{ .RelPermalink }}">{{ .Title }}</a>
+            </li>
+            {{ end }}
+            {{ end }}
+        </ul>
+    </section>
+    {{ end }}
+
     <section class="gdoc-nav--more">
         {{ if .Site.Data.menu.more.more }}
             <h2>More</h2>