add customers to main nav

config.toml

@@ -127,6 +127,12 @@ name       = "Customers"
 url        = "https://rancher.com/customers/"
 weight     = "3"
 
+[[menu.main]]
+identifier = "customers"
+name       = "Customers"
+url        = "/customers/"
+weight     = "4"
+
 [[menu.main]]
 identifier = "learn"
 name       = "Learn"