DEV: Remove unused instagram_user_info model

This has been unused since 703c724cf3

app/models/instagram_user_info.rb

@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-class InstagramUserInfo < ActiveRecord::Base
-
-  belongs_to :user
-
-end
-
-# == Schema Information
-#
-# Table name: instagram_user_infos
-#
-#  id                :integer          not null, primary key
-#  user_id           :integer
-#  screen_name       :string
-#  instagram_user_id :integer
-#  created_at        :datetime         not null
-#  updated_at        :datetime         not null
-#