✨ feat: use page description as summary

If neither page description or summary are available,
only the post title will be shown.

templates/atom.xml

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="{{ lang }}">
+    <title>{{ config.title }}
+        {%- if term %} - {{ term.name }}
+        {%- elif section.title %} - {{ section.title }}
+        {%- endif -%}
+    </title>
+    {%- if config.description %} <subtitle>{{ config.description }}</subtitle> {%- endif %} <link
+        href="{{ feed_url | safe }}" rel="self" type="application/atom+xml" />
+    <link
+        href="
+        {%- if section -%}
+            {{ section.permalink | escape_xml | safe }}
+        {%- else -%}
+            {{ config.base_url | escape_xml | safe }}
+        {%- endif -%}
+    " />
+    <generator
+        uri="https://www.getzola.org/">Zola</generator>
+    <updated>{{ last_updated | date(format="%+")
+    }}</updated>
+    <id>{{ feed_url | safe }}</id> {%- for page in pages %} <entry
+        xml:lang="{{ page.lang }}">
+        <title>{{ page.title }}</title>
+        <published>{{ page.date | date(format="%+") }}</published>
+        <updated>{{
+    page.updated | default(value=page.date) | date(format="%+") }}</updated>
+        <author>
+            <name>
+                {%- if page.authors -%}
+                    {{ page.authors[0] }}
+                {%- elif config.author -%}
+                    {{ config.author }}
+                {%- else -%}
+                    Unknown
+                {%- endif -%}
+            </name>
+        </author>
+        <link
+            rel="alternate" href="{{ page.permalink | safe }}" type="text/html" />
+        <id>{{
+    page.permalink | safe }}</id>
+    {% if page.summary %}
+        <summary type="html">{{ page.summary }}</summary>
+    {% elif page.description %}
+        <summary type="html">{{ page.description }}</summary>
+    {% endif %}
+    </entry>
+    {%- endfor %}
+</feed>