Refactor: Inbox store, remove inboxes from sidebar (#387)

* Refactor: Inbox store, remove inboxes from sidebar

* Add a new page for inbox settings

* Show inboxes on sidebar

* Add inbox_members API

* Disable similar-code check

* Fix codeclimate scss issues

* Add widget_color update API and actions

* Add specs for inbox store

* Fix Facebook auth flow

* Fix agent loading, inbox name

spec/factories/channel_widget.rb

@@ -4,6 +4,7 @@ FactoryBot.define do
   factory :channel_widget, class: 'Channel::WebWidget' do
     sequence(:website_name) { |n| "Example Website #{n}" }
     sequence(:website_url) { |n| "https://example-#{n}.com" }
+    sequence(:widget_color, &:to_s)
     account
   end
 end

spec/factories/inboxes.rb

@@ -3,7 +3,7 @@
 FactoryBot.define do
   factory :inbox do
     account
-    association :channel, factory: :channel_widget
     name { 'Inbox' }
+    channel { FactoryBot.build(:channel_widget, account: account) }
   end
 end