fix: modalities taxonomy, task_type, url consolidation, structural corrections

metadata.json

@@ -7,7 +7,7 @@
         "pt"
       ],
       "modalities": [
-        "multi_image",
+        "multi_image_start",
         "text"
       ],
       "task_type": "multiple_choice_vqa",
@@ -44,12 +44,11 @@
         },
         "source": {
           "format": "json",
-          "links": {
+          "url": {
             "2022": "https://huggingface.co/datasets/maritaca-ai/enem",
             "2023": "https://huggingface.co/datasets/maritaca-ai/enem",
             "2024": "https://huggingface.co/datasets/maritaca-ai/enem"
-          },
-          "url": "https://huggingface.co/datasets/maritaca-ai/enem"
+          }
         }
       }
     }