Use head meta tag for google site verification instead of html page (#87)

Signed-off-by: Hofi <[email protected]>

Author: HofiOne

_config.yml

@@ -101,6 +101,7 @@ author:
   name: OpenSource Community
   url: https://github.com/syslog-ng/syslog-ng
 
+google_site_verification: "B_ASm3harCQhWZo2naEV8zw-DuQ1NYUEnPZIac-mqy4"
 
 # When using this template with a project (repository) page set the baseurl to '/project-name'
 # For user/organization pages set this to an empty string