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

@@ -5,7 +5,8 @@ language_creators:
 - expert-generated
 languages:
 - ar
-licenses: []
+licenses:
+- unknown
 multilinguality:
 - monolingual
 size_categories: