Lock down allowed HTML (no links, no paragraphs even) for summary field

Ref #110

config/sync/field.field.node.people.field_summary.yml

@@ -6,7 +6,16 @@ dependencies:
     - field.storage.node.field_summary
     - node.type.people
   module:
+    - allowed_formats
     - text
+third_party_settings:
+  allowed_formats:
+    minimalhtmltitle: minimalhtmltitle
+    basic_html: '0'
+    minimalhtml: '0'
+    restricted_html: '0'
+    full_html: '0'
+    plain_text: '0'
 _core:
   default_config_hash: EXOljgShOmy983x8K_RBAJkJ2cWknYTQvOdpbfg3EC4
 id: node.people.field_summary