🎨 style(MainPage): add whitespace to button className

The whitespace was added to the button className to improve readability and consistency with the rest of the code.

src/frontend/src/pages/MainPage/index.tsx

@@ -73,7 +73,7 @@ export default function HomePage() {
               <Button
                 asChild
                 variant="outline"
-                className="text-gray-600 dark:text-gray-300"
+                className="text-gray-600 dark:text-gray-300 "
               >
                 <a
                   href="https://github.com/logspace-ai/langflow"