chore: move files around

src/Common/URL+File.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+extension URL {
+	/// Folder where user can mofifications to html template
+	static let UserModDir: URL? =
+		FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
+	
+	/// Returns `true` if file or folder exists.
+	@inlinable func exists() -> Bool {
+		FileManager.default.fileExists(atPath: self.path)
+	}
+	
+	/// Returns URL by deleting last path component
+	@inlinable func parentDir() -> URL {
+		self.deletingLastPathComponent()
+	}
+}