feat: revise robots.txt and sitemap.xml functions

src/sitemap.njk

@@ -5,9 +5,11 @@ eleventyExcludeFromCollections: true
 <?xml version="1.0" encoding="utf-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
     {% for page in collections.all %}
+        {% if not page.data.excludeFromSitemap %}
         <url>
             <loc>{{ site.url }}{{ page.url | url }}</loc>
             <lastmod>{{ page.date.toISOString() }}</lastmod>
         </url>
+        {% endif %}
     {% endfor %}
 </urlset>