Make Web engine an isolated namespace engine mounted on / (without /web prefix)

This approach is better to separate concerns, see “Isolated Engine” here: https://api.rubyonrails.org/v3.2/classes/Rails/Engine.html

engines/web/app/assets/javascripts/web/cookies_banner/cookies_banner_controller.js.coffee

@@ -1,6 +1,6 @@
 Darkswarm.controller "CookiesBannerCtrl", ($scope, CookiesBannerService, $http, $window)->
 
   $scope.acceptCookies = ->
-    $http.post('/web/api/cookies/consent')
+    $http.post('/api/cookies/consent')
     CookiesBannerService.close()
     CookiesBannerService.disable()

engines/web/config/routes.rb

@@ -1,9 +1,7 @@
 Web::Engine.routes.draw do
-  namespace :web do
-    namespace :api do
-      scope '/cookies' do
-        resource :consent, only: [:show, :create, :destroy], controller: "cookies_consent"
-      end
+  namespace :api do
+    scope '/cookies' do
+      resource :consent, only: [:show, :create, :destroy], controller: "cookies_consent"
     end
   end
 end

engines/web/lib/web/engine.rb

@@ -1,4 +1,5 @@
 module Web
   class Engine < ::Rails::Engine
+    isolate_namespace Web
   end
 end