Refactor: Move index.html to root and serve assets from /public

index.html

@@ -8,8 +8,8 @@
       content="Advanced SMTP Tester - Test your SMTP configurations securely and easily."
     />
     <title>Advanced SMTP Tester</title>
-    <link rel="icon" type="image/png" href="Logo.png" />
-    <link rel="stylesheet" href="styles.css" />
+    <link rel="icon" type="image/png" href="public/Logo.png" />
+    <link rel="stylesheet" href="public/styles.css" />
 
     <!-- Fonts -->
     <link rel="preconnect" href="https://fonts.googleapis.com" />
@@ -28,7 +28,7 @@
       <header class="header">
         <div class="header-content">
           <h1 class="title">
-            <img src="Logo.png" alt="Logo" class="title-icon" />
+            <img src="public/Logo.png" alt="Logo" class="title-icon" />
             SMTP Tester
           </h1>
           <p class="subtitle">
@@ -161,6 +161,6 @@
       </footer>
     </div>
 
-    <script src="script.js"></script>
+    <script src="public/script.js"></script>
   </body>
 </html>