add tag management link to data vault

Author: drusepth

app/views/data/index.html.erb

@@ -69,6 +69,20 @@
     <% end %>
   </div>
 
+  <div class="col s12 m12 l6">
+    <%= link_to tags_path, class: 'black-text' do %>
+      <div class="hoverable card purple lighten-5">
+        <div class="card-content">
+          <i class="material-icons right purple-text text-lighten-4"><%= PageTag.icon %></i>
+          <div class="card-title">Tag management</div>
+          <p>
+            Manage the tags you've used for your worldbuilding.
+          </p>
+        </div>
+      </div>
+    <% end %>
+  </div>
+
   <div class="col s12 m12 l6">
     <%= link_to notebook_export_path, class: 'black-text' do %>
       <div class="hoverable card brown lighten-3">