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

@@ -5,17 +5,15 @@ language_creators:
 - found
 languages:
 - en
-licenses: []
+licenses:
+- unknown
 multilinguality:
 - monolingual
 size_categories:
-  default:
-  - 10K<n<100K
-  dictionary:
-  - 100K<n<1M
-  ptb:
-  - 10K<n<100K
-source_datasets: []
+- 100K<n<1M
+- 10K<n<100K
+source_datasets:
+- original
 task_categories:
 - text-classification
 task_ids:
@@ -24,6 +22,10 @@ task_ids:
 - sentiment-scoring
 paperswithcode_id: sst
 pretty_name: Stanford Sentiment Treebank
+configs:
+- default
+- dictionary
+- ptb
 ---
 
 # Dataset Card for sst