Use custom path

CHDataManagement/Model/FileResource.swift

@@ -249,6 +249,9 @@ final class FileResource: Item {
      The result is an absolute path from the output folder for use in HTML.
      */
     var absoluteUrl: String {
+        if let customOutputPath {
+            return customOutputPath
+        }
         let path = pathPrefix + "/" + id
         return makeCleanAbsolutePath(path)
     }