UX: new layout for groups page, allow changes to automatic group bio (#7350)

app/serializers/basic_group_serializer.rb

@@ -19,6 +19,7 @@ class BasicGroupSerializer < ApplicationSerializer
              :flair_color,
              :bio_raw,
              :bio_cooked,
+             :bio_excerpt,
              :public_admission,
              :public_exit,
              :allow_membership_requests,
@@ -38,6 +39,10 @@ class BasicGroupSerializer < ApplicationSerializer
     end
   end
 
+  def bio_excerpt
+    PrettyText.excerpt(object.bio_cooked, 110) if object.bio_cooked.present?
+  end
+
   def include_incoming_email?
     staff?
   end