Add the feed that doesn't work

feed.xml.html

+---
+permalink: /feed.xml
+metadata:
+  title: ReverseEagle ─ Developers
+  url: http://developers.reverseeagle.org
+  author:
+    name: The ReverseEagle Project
+  feed:
+    subtitle: Privacy-conscious, ethical and safer alternatives to software for developers.
+    filename: feed.xml
+    path: /feed.xml
+    url: https://developers.reverseeagle.org/feed.xml
+    id: https://developers.reverseeagle.org
+---
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <title>{{ metadata.title }}</title>
+  <subtitle>{{ metadata.feed.subtitle }}</subtitle>
+  <link href="{{ metadata.feed.url }}" rel="self"/>
+  <link href="{{ metadata.url }}"/>
+  <updated>{{ collections.posts | rssLastUpdatedDate }}</updated>
+  <id>{{ metadata.feed.id }}</id>
+  <author>
+    <name>{{ metadata.author.name }}</name>
+  </author>
+  {% for replace in collections.replace %}
+    {% assign absolutePostUrl = replace.url | url | absoluteUrl(metadata.url) %}
+    <entry>
+      <title>{{ replace.data.title }}</title>
+      <link href="{{ absolutePostUrl }}"/>
+      <updated>{{ replace.date | rssDate }}</updated>
+      <id>{{ absolutePostUrl }}</id>
+      <content type="html">{{ replace.templateContent | htmlToAbsoluteUrls(absolutePostUrl) }}</content>
+    </entry>
+  {%- endfor %}
+</feed>