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

@@ -6,8 +6,8 @@ language_creators:
 languages:
 - en
 licenses:
-- cc-by-sa-3-0
-- gfdl-1-3-or-later
+- cc-by-sa-3.0
+- gfdl-1.3-or-later
 multilinguality:
 - monolingual
 paperswithcode_id: wikitext-2