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

@@ -6,18 +6,12 @@ language_creators:
 languages:
 - en
 licenses:
-- cc-by-3-0
+- cc-by-3.0
 multilinguality:
 - monolingual
 size_categories:
-  task1_qa:
-  - 100K<n<1M
-  task2_recs:
-  - 1M<n<10M
-  task3_qarecs:
-  - 100K<n<1M
-  task4_reddit:
-  - 100K<n<1M
+- 100K<n<1M
+- 1M<n<10M
 source_datasets:
 - original
 task_categories:
@@ -27,6 +21,11 @@ task_ids:
 - dialogue-modeling
 paperswithcode_id: mdd
 pretty_name: Movie Dialog dataset (MDD)
+configs:
+- task1_qa
+- task2_recs
+- task3_qarecs
+- task4_reddit
 ---
 
 # Dataset Card for MDD