Updates to use newest alpha release with on-request image optimization during --serve. Cleans up config and data

content/sitemap.xml.njk

@@ -0,0 +1,15 @@
+---
+permalink: /sitemap.xml
+layout: false
+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>