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 +5,7 @@ paperswithcode_id: commongen
 pretty_name: CommonGen
 task_ids:
 - text2text-generation-other-concepts-to-text
-tasks_categories:
+task_categories:
 - text2text-generation
 ---