Update URL for Flying Rat Studio

Corrected the URL for "Flying Rat Studio" from "https://www.flying-rat.online/" to "https://www.flying-rat.studio/" in the `Index.razor` file. This ensures users are directed to the correct website.

Portfolio/Pages/Index.razor

@@ -76,7 +76,7 @@
         <div class="d-flex flex-column flex-md-row justify-content-between mb-5">
             <div class="flex-grow-1">
                 <h3 class="mb-0">Software Developer</h3>
-                <div class="subheading mb-3"><a href="https://www.flying-rat.online/" target="_blank">Flying Rat Studio</a></div>
+                <div class="subheading mb-3"><a href="https://www.flying-rat.studio/" target="_blank">Flying Rat Studio</a></div>
                 <ul>
                     <li>Develop, test, and debug software applications using Unreal Engine.</li>
                     <li>Specialize in networking and gameplay systems for multiplayer games.</li>