Moved Partner TLS under Pre-delivery deployment, added a redirect

Author: caley-b

public/__redirects

@@ -450,7 +450,7 @@
 /cloudflare-one/email-security/directories/manage-ms-directories/ /cloudflare-one/email-security/directories/manage-integrated-directories/ 301
 /cloudflare-one/email-security/directories/manage-ms-directories/manage-groups-directory/ /cloudflare-one/email-security/directories/manage-integrated-directories/manage-groups-directory/ 301
 /cloudflare-one/email-security/directories/manage-ms-directories/manage-users-directory/ /cloudflare-one/email-security/directories/manage-integrated-directories/manage-users-directory/ 301
-
+/cloudflare-one/email-security/setup/partner-domain-tls/ /cloudflare-one/email-security/setup/pre-delivery-deployment/partner-domain-tls/ 301
 
 # firewall
 /firewall/api/cf-lists/ /waf/tools/lists/lists-api/ 301