Defined the DocumentrationFolder enumeration type in. the library target and also, conformed it to the Pathable protocol.

Sources/DocCMiddleware/Internal/Enumerations/DocumentationFolder.swift

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+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the Hummingbird DocC Middleware open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the Hummingbird DocC Middleware project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of Hummingbird DocC Middleware project authors
+//
+// ===----------------------------------------------------------------------===
+
+/// An enumeration that represents the documentation folders that could be generated by the `DocC` building process.
+enum DocumentationFolder: String, CaseIterable {
+    /// An article document, which can also be used for (source code generated) technical documentation as well.
+    case article = "documentation"
+    /// A tutorial document.
+    case tutorial = "tutorials"
+}
+
+// MARK: - Pathable
+
+extension DocumentationFolder: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        .init(format: .Format.Path.root, rawValue)
+    }
+    
+}