Update task category to text-ranking

Update task category to text-ranking to be more accurate.

README.md

@@ -1,4 +1,12 @@
 ---
+language:
+- en
+license: cc-by-sa-4.0
+size_categories:
+- 100K<n<1M
+task_categories:
+- text-ranking
+pretty_name: HN Remove 100K
 dataset_info:
   features:
   - name: query_id
@@ -34,14 +42,6 @@ configs:
   data_files:
   - split: train
     path: data/train-*
-license: cc-by-sa-4.0
-task_categories:
-- question-answering
-language:
-- en
-pretty_name: HN Remove 100K
-size_categories:
-- 100K<n<1M
 ---
 
 # Dataset Card for HN-Remove 100K
@@ -134,5 +134,4 @@ def get_md5_hash(text):
       archivePrefix={arXiv},
       primaryClass={cs.IR},
       url={https://arxiv.org/abs/2505.16967}, 
-}
-```
+}