Hide unfinished work for release

lib/views/admin/customize.html

@@ -65,11 +65,13 @@
                 data-theme="{{ webpack_asset('style-theme-default-dark').css }}">
               {% include 'widget/theme-colorbox.html' %}
             </a>
+            {# Hide temporary for release v3.0.8 -- 2018.04.24 Yuki Takei
             <a id="theme-option-nature"
              class="nature"
              data-theme="{{ webpack_asset('style-theme-nature').css }}">
               {% include 'widget/theme-colorbox.html' %}
             </a>
+            #}
           </div>
 
           <div class="form-group">