Revert "feat: Support config files with viper (#4558)" (#4692)

This reverts commit c8e299c8f1.

cli/config/file.go

@@ -6,10 +6,6 @@ import (
 	"path/filepath"
 )
 
-const (
-	FlagName = "global-config"
-)
-
 // Root represents the configuration directory.
 type Root string
 
@@ -46,10 +42,6 @@ func (r Root) PostgresPort() File {
 	return File(filepath.Join(r.PostgresPath(), "port"))
 }
 
-func (r Root) DeploymentConfigPath() string {
-	return filepath.Join(string(r), "server.yaml")
-}
-
 // File provides convenience methods for interacting with *os.File.
 type File string