Serve atom feed at /feed and /feed.xml

source/feed.liquid

@@ -1,5 +1,12 @@
 ---
-permalink: 'feed.xml'
+pagination:
+  data: urls
+  alias: url
+  size: 1
+urls:
+  - 'feed.xml'
+  - 'feed'
+permalink: '{{ url }}'
 eleventyExcludeFromCollections: true
 ---
 <?xml version="1.0" encoding="utf-8"?>
@@ -7,7 +14,7 @@ eleventyExcludeFromCollections: true
   <title>Sass Blog</title>
   <id>{{ '/blog' | absoluteUrl: site.url }}</id>
   <link href="{{ '/blog' | absoluteUrl: site.url }}"/>
-  <link href="{{ page.url | absoluteUrl: site.url }}" rel="self"/>
+  <link href="{{ '/feed.xml' | absoluteUrl: site.url }}" rel="self"/>
   <updated>{{ collections.blog | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
   {%- assign posts = collections.blog | reverse -%}
   {%- for post in posts limit:6 %}
@@ -17,6 +24,7 @@ eleventyExcludeFromCollections: true
     <link href="{{ absolutePostUrl }}" rel="alternate"/>
     <id>{{ absolutePostUrl }}</id>
     <published>{{ post.date | dateToRfc3339 }}</published>
+    <updated>{{ post.date | dateToRfc3339 }}</updated>
     <author>
       <name>{{ post.data.author }}</name>
     </author>