refactor: migrate to /blog subdirectory

src/_pages/blog/feed/feed.njk

@@ -0,0 +1,27 @@
+---
+# Metadata comes from _data/metadata.json
+permalink: /blog/feed/feed.xml
+---
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom" xml:base="{{ metadata.language }}">
+	<title>{{ metadata.title }}</title>
+	<subtitle>{{ metadata.description }}</subtitle>
+	<link href="{{ permalink | htmlBaseUrl(metadata.url) }}" rel="self"/>
+	<link href="{{ metadata.url | addPathPrefixToFullUrl }}"/>
+	<updated>{{ collections.articles | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
+	<id>{{ metadata.url }}</id>
+	<author>
+		<name>{{ metadata.author.name }}</name>
+		<email>{{ metadata.author.email }}</email>
+	</author>
+	{%- for article in collections.articles | reverse %}
+	{% set absolutePostUrl %}{{ article.url | htmlBaseUrl(metadata.url) }}{% endset %}
+	<entry>
+		<title>{{ article.data.title }}</title>
+		<link href="{{ absolutePostUrl }}"/>
+		<updated>{{ article.date | dateToRfc3339 }}</updated>
+		<id>{{ absolutePostUrl }}</id>
+		<content type="html">{{ article.templateContent | transformWithHtmlBase(absolutePostUrl, article.url) }}</content>
+	</entry>
+	{%- endfor %}
+</feed>