https://www.namecheap.com/support/knowledgebase/article.aspx/9411/2187/how-to-set-up-and-manage-wordpress-multisite-wpmu#map1
https://www.namecheap.com/support/knowledgebase/article.aspx/9411/2187/how-to-set-up-and-manage-wordpress-multisite-wpmu#map1