Deprecate dataset (#5)

- Deprecate dataset (0a7e8e39b3d9f17fbcc344d4fc1ff9b7d3a60ba2)

README.md

@@ -342,6 +342,10 @@ configs:
     path: ru_to_zh/train-*
 ---
 
+<div class="course-tip course-tip-orange bg-gradient-to-br dark:bg-gradient-to-r before:border-orange-500 dark:before:border-orange-800 from-orange-50 dark:from-gray-900 to-white dark:to-gray-950 border border-orange-50 text-orange-700 dark:text-gray-400">
+  <p><b>Deprecated:</b> Dataset "un_ga" is deprecated due to the the unavailability of its source data. It has been superseded by the official United Nations Parallel Corpus, which is recommended for use in its place: <a href="https://huggingface.co/datasets/un_pc">un_pc</a></p>
+</div>
+
 # Dataset Card for [Dataset Name]
 
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