refactor result generation

app/views/dashboard/index.html.erb

@@ -84,7 +84,7 @@
       <div class="flex items-center h-full">
         <div class="mx-auto">
           <div class="max-w-xl mx-auto">
-            <h1 class="text-5xl font-bold text-base-content">👋 Welcome to DocuSeal</h1>
+            <h1 class="text-5xl font-bold text-base-content">👋 Welcome to <%= Docuseal.product_name %></h1>
           </div>
           <div class="max-w-lg mx-auto">
             <p class="py-6 text-gray-600">Streamline document workflows, from creating customizable templates to filling and signing document forms</p>