ADD: Yandex verification option. (1)

Author: ivan-nginx

layout/_partials/head.swig

@@ -13,6 +13,11 @@
 {% endif %}
 
 
+{% if theme.yandex_site_verification %}
+  <meta name="yandex-verification" content="{{ theme.yandex_site_verification }}" />
+{% endif %}
+
+
 {% if theme.baidu_site_verification %}
   <meta name="baidu-site-verification" content="{{ theme.baidu_site_verification }}" />
 {% endif %}