Remove S3Backend stub

pkg/archive/s3Backend.go

@@ -1,14 +0,0 @@
-// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
-// All rights reserved. This file is part of cc-backend.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
-
-package archive
-
-type S3ArchiveConfig struct {
-	Path string `json:"filePath"`
-}
-
-type S3Archive struct {
-	path string
-}