Only predict on folders, no longer support single image

Closes #209 (closed)

dan/ocr/predict/__init__.py

@@ -17,13 +17,7 @@ def add_predict_parser(subcommands) -> None:
         help=__doc__,
     )
     # Required arguments.
-    image_or_folder_input = parser.add_mutually_exclusive_group(required=True)
-    image_or_folder_input.add_argument(
-        "--image",
-        type=pathlib.Path,
-        help="Path to the image to predict.",
-    )
-    image_or_folder_input.add_argument(
+    parser.add_argument(
         "--image-dir",
         type=pathlib.Path,
         help="Path to the folder where the images to predict are stored.",