Reorganize saving, generate feed

CHDataManagement/Storage/Storage.swift

@@ -13,6 +13,9 @@ import Foundation
  */
 final class Storage {
 
+    static let outputPathBookmarkKey = "outputPathBookmark"
+    static let contentPathBookmarkKey = "contentPathBookmark"
+
     private(set) var baseFolder: URL
 
     private let encoder = JSONEncoder()
@@ -252,7 +255,7 @@ final class Storage {
     private func deleteFiles(in folder: URL, notIn fileSet: Set<String>) throws {
         let filesToDelete = try files(in: folder)
             .filter { !fileSet.contains($0.lastPathComponent) }
-        
+
         for file in filesToDelete {
             try fm.removeItem(at: file)
             print("Deleted \(file.path())")