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

@@ -7,7 +7,7 @@ languages:
 - en
 - nl
 licenses:
-- cc-by-nc-4-0
+- cc-by-nc-4.0
 multilinguality:
 - multilingual
 size_categories: