Add banner images to RSS feed

_config.yml

@@ -1,3 +1,3 @@
 title: OpenNeo Blog
-url: https://blog.openneo.net/
+url: https://blog.openneo.net
 description: For Dress to Impress, and uhh maybe other things later!

feed.xml

@@ -1,22 +1,37 @@
 ---
 layout: null
 ---
-
 <?xml version="1.0" encoding="UTF-8" ?>
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
     <channel>
         <title>{{ site.title }}</title>
         <link>{{ site.url }}</link>
-        <atom:link href="{{ page.url | prepend: site.url }}" rel="self" type="application/rss+xml" />
+        <atom:link
+            href="{{ page.url | prepend: site.url }}"
+            rel="self"
+        type="application/rss+xml" />
         <description>{{ site.description }}</description>
         <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
+        <language>en-us</language>
         {% for post in site.posts %}
         <item>
             <title>{{ post.title }}</title>
             <link>
                 {{ post.url | prepend: site.url }}
             </link>
+            {% if post.author %}
+            <author>{{ post.author }}</author>
+            {% endif %}
             <description>
+                {% if post.banner %}
+                <![CDATA[
+                    <img
+                        src="{{ post.banner.url }}"
+                        width="{{ post.banner.width }}"
+                        height="{{ post.banner.height }}"
+                    />
+                ]]>
+                {% endif %}
                 {{ post.content | escape }}
             </description>
             <pubDate>{{ post.date | date_to_rfc822 }}</pubDate>