improve registration and add oauth

app/controllers/dashboard_controller.rb

@@ -4,6 +4,7 @@ class DashboardController < ApplicationController
   skip_before_action :authenticate_user!, only: %i[index]
 
   def index
+    return redirect_to Docuseal::PRODUCT_URL, allow_other_host: true if Docuseal.multitenant? && !signed_in?
     return render 'pages/landing' unless signed_in?
 
     templates = current_account.templates.active.preload(:author).order(id: :desc)