Added Support for Signin + Dark for startupcss

Updated Startup.css for 3 different scenarios

Supporting now Dark + Signin in StartupCSS

app/helpers/application_helper.rb

@@ -236,14 +236,14 @@ module ApplicationHelper
   end
 
   def use_startup_css?
-    Feature.enabled?(:startup_css) && !Rails.env.test?
+    (Feature.enabled?(:startup_css) || params[:startup_css] == 'true' || cookies['startup_css'] == 'true') && !Rails.env.test?
   end
 
   def stylesheet_link_tag_defer(path)
     if use_startup_css?
-      stylesheet_link_tag(path, media: "print")
+      stylesheet_link_tag(path, media: "print", crossorigin: ActionController::Base.asset_host ? 'anonymous' : nil )
     else
-      stylesheet_link_tag(path, media: "all")
+      stylesheet_link_tag(path, media: "all" )
     end
   end
 

app/views/layouts/_startup_css.haml

 - return unless use_startup_css?
 
+- startup_filename = current_path?("sessions#new") ? 'signin' : user_application_theme == 'gl-dark' ? 'dark' : 'general'
+
 %style{ type: "text/css" }
-  = Rails.application.assets_manifest.find_sources('startup/startup-general.css').first.to_s.html_safe
+  = Rails.application.assets_manifest.find_sources("startup/startup-#{startup_filename}.css").first.to_s.html_safe