Remove config names as yaml keys (#4367)

* validate YAML part

* fix bad YAML keys

* don't have config names as yaml keys

* style

* Remove hacking license tags when mirroring datasets on the Hub

* fix test

* fix style

* more fixes

* remove dots in QA column mapping keys

Commit from https://github.com/huggingface/datasets/commit/3f3013441e4af9bf4efa752b5e6e184a588b7a80

README.md

@@ -10,14 +10,9 @@ licenses:
 multilinguality:
 - monolingual
 size_categories:
-  nell_belief:
-  - 1M<n<10M
-  nell_belief_sentences:
-  - 10M<n<100M
-  nell_candidate:
-  - 10M<n<100M
-  nell_candidate_sentences:
-  - 100M<n<1B
+- 100M<n<1B
+- 10M<n<100M
+- 1M<n<10M
 source_datasets:
 - original
 task_categories:
@@ -30,6 +25,11 @@ task_ids:
 - relation-extraction
 paperswithcode_id: nell
 pretty_name: Never Ending Language Learning (NELL)
+configs:
+- nell_belief
+- nell_belief_sentences
+- nell_candidate
+- nell_candidate_sentences
 ---
 
 # Dataset Card for Never Ending Language Learning (NELL)