fix links to all tags, add package lock

.gitignore

@@ -1,3 +1,2 @@
 _site/
-node_modules/
-package-lock.json
+node_modules/

_includes/layouts/post.njk

@@ -27,7 +27,7 @@ layout: layouts/base.njk
         <div>
             <span>Tagged In:</span><br />
             {%- for tag in tags | filterTagList %}
-                <a href="/tag/{{ tag | slugify }}" class="btn block">{{ tag }}</a>
+                <a href="/tags/{{ tag | slugify }}" class="btn block">{{ tag }}</a>
             {%- endfor %}
         </div>
     {%- endif %}