Updated some controllers to inherit from EmptyController

• Updated:
- some controllers to inherit from EmptyController

app/controllers/api/v1/custom_emojis_controller.rb

@@ -1,13 +1,8 @@
 # frozen_string_literal: true
 
-class Api::V1::CustomEmojisController < Api::BaseController
-  respond_to :json
-
-  skip_before_action :set_cache_headers
-
+class Api::V1::CustomEmojisController < EmptyController
   def index
-    render_cached_json('api:v1:custom_emojis', expires_in: 1.minute) do
-      ActiveModelSerializers::SerializableResource.new(CustomEmoji.local.where(disabled: false), each_serializer: REST::CustomEmojiSerializer)
-    end
+    data = ActiveModelSerializers::SerializableResource.new(CustomEmoji.local.where(disabled: false), each_serializer: REST::CustomEmojiSerializer)
+    render json: data.to_json, content_type: 'application/json'
   end
 end