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

@@ -6,7 +6,7 @@ language_creators:
 languages:
 - ko
 licenses:
-- cc-by-nd-2-0
+- cc-by-nd-2.0
 multilinguality:
 - monolingual
 size_categories:
@@ -19,7 +19,7 @@ task_categories:
 task_ids:
 - extractive-qa
 paperswithcode_id: null
-pretty_name: KorQuAD v2-1
+pretty_name: KorQuAD v2.1
 ---
 
 # Dataset Card for KorQuAD v2.1