Add file

docs/_includes/meta.html

@@ -8,6 +8,14 @@
     </div>
   {% endif %}
 
+  {% if include.experimental %}
+    <div class="control">
+      <div class="tags">
+        <span class="tag is-warning">Experimental</span>
+      </div>
+    </div>
+  {% endif %}
+
   {% if include.since %}
     <div class="control">
       <div class="tags has-addons">

docs/_includes/subnav-form.html

@@ -19,6 +19,12 @@
       <a class="navbar-item is-tab {% if page.doc-subtab == 'radio' %}is-active{% endif %}" href="{{ site.url }}/documentation/form/radio/">
         Radio
       </a>
+      <a class="navbar-item is-tab {% if page.doc-subtab == 'file' %}is-active{% endif %}" href="{{ site.url }}/documentation/form/file/">
+        File
+        <span class="tag is-success" style="margin-left: 1em;">
+          New!
+        </span>
+      </a>
     </div>
   </div>
 </nav>