Update alt images

Author: tutosrive

index.html

@@ -65,7 +65,7 @@
             <div class="w-full text-center">
                 <h1 class="text-3xl font-bold inline">
                     <a href="https://github.com/dev2forge" target="_blank" class="flex justify-center">    
-                        <img id="thumbnail-dev2forge" class="thumbnail-dev2forge img-fluid" />
+                        <img id="thumbnail-dev2forge" class="thumbnail-dev2forge img-fluid" alt="Dev2Forge Thumbnail, logo thumbnail."/>
                     </a>
                 </h1>
             </div>