fix: sitemap.njk — remove empty line on the first line (#296)

fix: `sitemap.njk` — remove empty line on the first line

Author: EmptyWork

src/sitemap.njk

@@ -2,7 +2,6 @@
 permalink: /sitemap.xml
 eleventyExcludeFromCollections: true
 ---
-
 <?xml version="1.0" encoding="utf-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
 {% for page in collections.all %}