add link to view all tags to tag pages

src/meta/tag-pages.njk

@@ -9,6 +9,8 @@ eleventyComputed:
   title: "tag: {{ tag.tagName }}"
 ---
 
+<p class="centered">(or <a href="/tags/">view all tags</a>)</p>
+
 {% set postlist = tag.pageData %}
 {% include "postlist.njk" %}