feat: add archive RSS feed

website/source/archive.xml.twig

@@ -0,0 +1,35 @@
+---
+title: Feed
+permalink: /archive.xml
+use:
+    - daily_emails
+---
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+    <title><![CDATA[{{ site.name }}]]></title>
+    <link href="{{ site.url }}{{ page.url }}" rel="self"/>
+    <link href="{{ site.url }}"/>
+    <updated>{{ site.calculated_date|date('c') }}</updated>
+    <id>{{ site.url }}/</id>
+    {% if site.author or site.email %}
+        <author>
+            {% if site.author %}<name><![CDATA[{{ site.author }}]]></name>{% endif %}
+        </author>
+    {% endif %}
+    <generator uri="http://sculpin.io/">Sculpin</generator>
+    {% for post in data.daily_emails|slice(0, 31) %}
+        <entry>
+            <title type="html"><![CDATA[{{ post.title }}]]></title>
+            <link href="{{ site.url }}{{ post.url }}"/>
+            <updated>{{ post.date|date('c') }}</updated>
+            <id>{{ site.url }}{{ post.url }}</id>
+            {% if post.summary %}
+                <content type="html"><![CDATA[{{ post.summary|markdown }}]]></content>
+            {% elseif post.blocks.excerpt %}
+                <content type="html"><![CDATA[{{ post.blocks.excerpt|markdown }}]]></content>
+            {% else %}
+                <content type="html"><![CDATA[{{ post.blocks.content|markdown }}]]></content>
+            {% endif %}
+        </entry>
+    {% endfor %}
+</feed>