Update CSS styling and add footer links in app.py

Updated CSS to include width and text alignment properties improving the presentation of the application. The footer was also enhanced by adding links to Blog, Twitter, LinkedIn and forms for users interested in AI evaluator roles or stress testing their AI models.

app.py

@@ -259,7 +259,7 @@ with gr.Blocks(
         """
         [Blog](https://huggingface.co/blog/arena-lighthouz) | [Twitter](https://twitter.com/lighthouzai) | [LinkedIn](https://www.linkedin.com/company/lighthouz-ai) | [Want to continue the fun? Sign up to be an AI evaluator](https://forms.gle/NBS7e7tav5ZYgoWK9) | [Want to get your AI models stress tested? Sign up here](https://forms.gle/ecM1eCxFeraoVDgH7)
         """,
-        elem_classes=["w-100", "text-center"]
+        elem_classes=["w-100", "text-center"],
     )
     with gr.Tab(label="⚔️ Arena"):
         gr.Markdown(