Generate an Atom feed instead of an RSS feed

I did this for changelog.xml as an experiment. Mostly because I wanted
to see what would happen if I did it.

I'm curious to see how an RSS reader handles the differences between
changes with stable ids being present. The RSS generator for RSS
wouldn't include the id attribute.

lib/git_commit_changelog_target.rb

@@ -4,7 +4,7 @@ class GitCommitChangelogTarget
   TARGET_PATH = Build.target_dir + "/changelog.xml"
   AUTHOR = "Dan Ott".freeze
   TITLE = "Dan Ott's Website Changelog"
-  URL = "https://danott.website"
+  URL = "https://danott.website/changelog.xml"
 
   def to_target
     self
@@ -15,19 +15,20 @@ def hydrate
   end
 
   def render
-    RSS::Maker.make("2.0") do |maker|
-      maker.channel.author = AUTHOR
-      maker.channel.updated = commits.map(&:date).max.to_s
-      maker.channel.about = URL
-      maker.channel.title = TITLE
+    RSS::Maker.make("atom") do |maker|
+      maker.channel.id = URL
       maker.channel.link = URL
+      maker.channel.title = TITLE
       maker.channel.description = TITLE
+      maker.channel.author = AUTHOR
+      maker.channel.updated = commits.map(&:date).max.to_s
 
       commits.each do |commit|
         maker.items.new_item do |maker_item|
-          maker_item.description = commit.description
+          maker_item.id = commit.link
           maker_item.link = commit.link
           maker_item.title = commit.title
+          maker_item.summary = commit.summary
           maker_item.updated = commit.updated
         end
       end
@@ -56,7 +57,7 @@ def title
         subject
       end
 
-      def description
+      def summary
         options = {
           auto_ids: false,
           hard_wrap: false,

lib/includable.rb

@@ -11,7 +11,7 @@ module Includable
       <link rel="stylesheet" href="/stylesheets/pygments-monokai.css" media="(prefers-color-scheme: dark)">
 
       <link rel="alternate" type="application/rss+xml" href="/feed.xml" title="Dan Ott's Website RSS Feed">
-      <link rel="alternate" type="application/rss+xml" href="/changelog.xml" title="Dan Ott's Website Changelog">
+      <link rel="alternate" type="application/atom+xml" href="/changelog.xml" title="Dan Ott's Website Changelog">
 
       <script src="/javascripts/script.js"></script>
     </include-in-header>