fix ref

_config.yml

@@ -42,6 +42,7 @@ collections:
     permalink: /:slug
 
 feed:
+  path: feed.xml
   collections:
     notes:
       path: "/feed.xml"

_layouts/note.html

@@ -5,11 +5,12 @@ layout: default
   <article class="w-50">
     <header class="mb2">
       <h1>{{ page.title }}</h1>
+      {% if page.date_created %}
         <time class="code dib f7 ph3 pv2 ba br-pill" datetime="{{ page.date_created | date_to_xmlschema }}">{% if page.type != 'pages' %}
           Created on {{ page.date_created | date: "%B %-d, %Y" }}
           {% endif %}
         </time>
-    </header>
+      {% endif %}
       <time class="code dib f7 ph3 pv2 ba br-pill" datetime="{{ page.last_modified_at | date_to_xmlschema }}">{% if page.type != 'pages' %}
         Last updated on {{ page.last_modified_at | date: "%B %-d, %Y" }}
         {% endif %}