Remove Slimmer Gem and config

- TODO will be addressed in a later commit, for the moment
  just remove all slimmer calls

Gemfile

@@ -13,7 +13,6 @@ gem "govuk_publishing_components"
 gem "jwt"
 gem "plek"
 gem "ratelimit"
-gem "slimmer"
 gem "sprockets-rails"
 gem "terser"
 

Gemfile.lock

@@ -152,7 +152,7 @@ GEM
     govuk_personalisation (1.0.0)
       plek (>= 1.9.0)
       rails (>= 6, < 8)
-    govuk_publishing_components (45.2.0)
+    govuk_publishing_components (45.3.0)
       chartkick
       govuk_app_config
       govuk_personalisation (>= 0.7.0)
@@ -461,7 +461,7 @@ GEM
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (2.2.0)
+    rackup (2.2.1)
       rack (>= 3)
     rails (7.2.2)
       actioncable (= 7.2.2)
@@ -594,13 +594,6 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    slimmer (18.6.2)
-      json
-      nokogiri (~> 1.7)
-      null_logger
-      plek (>= 1.1.0)
-      rack (>= 3.0)
-      rest-client
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -657,7 +650,6 @@ DEPENDENCIES
   rspec-rails
   rubocop-govuk
   simplecov
-  slimmer
   sprockets-rails
   terser
   timecop

app/controllers/application_controller.rb

@@ -1,8 +1,6 @@
 class ApplicationController < ActionController::Base
   include GovukPersonalisation::ControllerConcern
 
-  include Slimmer::Template
-
   before_action :set_cache_control_header
 
   # Prevent CSRF attacks by raising an exception.
@@ -48,8 +46,6 @@ def use_govuk_account_layout?
     false
   end
 
-  slimmer_template :gem_layout
-
 private
 
   def set_cache_control_header

app/controllers/subscriptions_management_controller.rb

@@ -1,6 +1,4 @@
 class SubscriptionsManagementController < ApplicationController
-  include Slimmer::Headers
-  include Slimmer::Template
   before_action :handle_one_login_hint, only: [:index]
   before_action :require_authentication
   before_action :get_subscription_details
@@ -98,7 +96,8 @@ def confirmed_unsubscribe_all
   def use_govuk_account_layout?
     @use_govuk_account_layout ||=
       if authenticated_via_account?
-        set_slimmer_headers(template: "gem_layout_account_manager")
+        # TODO: HERE WE NEED THE ACCOUNT MANAGER LAYOUT
+        # set_slimmer_headers(template: "gem_layout_account_manager")
         true
       end
   end

spec/spec_helper.rb

@@ -9,7 +9,6 @@
 require File.expand_path("../config/environment", __dir__)
 require "rspec/rails"
 require "webmock/rspec"
-require "slimmer/rspec"
 require "gds_api/test_helpers/account_api"
 require "gds_api/test_helpers/email_alert_api"