Update _config.yml

Modify production_url _http_ to _https_

_config.yml

@@ -25,7 +25,7 @@ author :
 # Else if you are pushing to username.github.io, replace with your username.
 # Finally if you are pushing to a GitHub project page, include the project name at the end.
 #
-production_url : http://okinawadevops.github.io
+production_url : https://okinawadevops.github.io
 
 # All Jekyll-Bootstrap specific configurations are namespaced into this hash
 #