Remove unused vocabularies.

Now all the terms that belonged to these vocabularies are in the topics vocabulary.

config/sync/field.field.node.article.field_regions.yml

@@ -5,7 +5,7 @@ dependencies:
   config:
     - field.storage.node.field_regions
     - node.type.article
-    - taxonomy.vocabulary.vocabulary_2
+    - taxonomy.vocabulary.topics
 id: node.article.field_regions
 field_name: field_regions
 entity_type: node
@@ -20,7 +20,7 @@ settings:
   handler: 'default:taxonomy_term'
   handler_settings:
     target_bundles:
-      vocabulary_2: vocabulary_2
+      topics: topics
     sort:
       field: name
       direction: asc