refactor: migrate to /blog subdirectory

src/_pages/blog/feed/feed.11tydata.js

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+module.exports = {
+  eleventyExcludeFromCollections: true
+}

src/_pages/blog/feed/feed.njk

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+---
+# 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>

src/_pages/blog/feed/json.njk

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+---
+# Metadata comes from _data/metadata.json
+permalink: /blog/feed/feed.json
+---
+{
+  "version": "https://jsonfeed.org/version/1.1",
+  "title": "{{ metadata.title }}",
+  "language": "{{ metadata.language }}",
+  "home_page_url": "{{ metadata.url | addPathPrefixToFullUrl }}",
+  "feed_url": "{{ permalink | htmlBaseUrl(metadata.url) }}",
+  "description": "{{ metadata.description }}",
+  "author": {
+    "name": "{{ metadata.author.name }}",
+    "url": "{{ metadata.author.url }}"
+  },
+  "items": [
+    {%- for article in collections.articles | reverse %}
+    {%- set absoluteArticleUrl = article.url | htmlBaseUrl(metadata.url) %}
+    {
+      "id": "{{ absoluteArticleUrl }}",
+      "url": "{{ absoluteArticleUrl }}",
+      "title": "{{ article.data.title }}",
+      "content_html": {% if article.templateContent %}{{ article.templateContent | transformWithHtmlBase(absoluteArticleUrl, article.url) | dump | safe }}{% else %}""{% endif %},
+      "date_published": "{{ article.date | dateToRfc3339 }}"
+    }
+    {% if not loop.last %},{% endif %}
+    {%- endfor %}
+  ]
+}