seo improvements

shared/_includes/sitemap.njk

@@ -5,6 +5,8 @@
   <url>
     <loc>{{ site.url }}{{ page.url }}</loc>
     <lastmod>{{ page.date | date }}</lastmod>
+    <changefreq>{% if page.url == "/" %}weekly{% else %}monthly{% endif %}</changefreq>
+    <priority>{% if page.url == "/" %}1.0{% elif parent %}0.8{% else %}0.7{% endif %}</priority>
   </url>
   {%- endif %}
 {%- endfor %}