refactor: migrate tags and sitemap to /blog subdirectory

src/_pages/blog/sitemap/sitemap.njk

@@ -0,0 +1,14 @@
+---
+permalink: /blog/sitemap.xml
+eleventyExcludeFromCollections: true
+---
+<?xml version="1.0" encoding="utf-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml">
+{%- for page in collections.all %}
+  {% set absoluteUrl %}{{ page.url | htmlBaseUrl(metadata.url) }}{% endset %}
+  <url>
+    <loc>{{ absoluteUrl }}</loc>
+    <lastmod>{{ page.date | htmlDateString }}</lastmod>
+  </url>
+{%- endfor %}
+</urlset>

src/_pages/blog/tags.njk

@@ -12,7 +12,7 @@ pagination:
 layout: home.njk
 eleventyComputed:
   title: Tags “{{ tag }}”
-permalink: /tags/{{ tag | slugify }}/
+permalink: /blog/tags/{{ tag | slugify }}/
 ---
 <div class="main-content">
   <h1>#{{ tag }}</h1>