Update datasets task tags to align tags with models (#4067)

* update tasks list

* update tags in dataset cards

* more cards updates

* update dataset tags parser

* fix multi-choice-qa

* style

* small improvements in some dataset cards

* allow certain tag fields to be empty

* update vision datasets tags

* use multi-class-image-classification and remove other tags

Commit from https://github.com/huggingface/datasets/commit/edb4411d4e884690b8b328dba4360dbda6b3cbc8

README.md

@@ -32,39 +32,9 @@ source_datasets:
 - extended|other-db_pedia
 - original
 task_categories:
-  release_v1:
-  - conditional-text-generation
-  release_v2:
-  - conditional-text-generation
-  release_v2-1:
-  - conditional-text-generation
-  release_v2-1_constrained:
-  - conditional-text-generation
-  release_v2_constrained:
-  - conditional-text-generation
-  release_v3-0_en:
-  - conditional-text-generation
-  release_v3-0_ru:
-  - conditional-text-generation
-  webnlg_challenge_2017:
-  - conditional-text-generation
+- tabular-to-text
 task_ids:
-  release_v1:
-  - other-structured-to-text
-  release_v2:
-  - other-structured-to-text
-  release_v2-1:
-  - other-structured-to-text
-  release_v2-1_constrained:
-  - other-structured-to-text
-  release_v2_constrained:
-  - other-structured-to-text
-  release_v3-0_en:
-  - other-structured-to-text
-  release_v3-0_ru:
-  - other-structured-to-text
-  webnlg_challenge_2017:
-  - other-structured-to-text
+- rdf-to-text
 paperswithcode_id: webnlg
 pretty_name: WebNLG
 ---