Remove OG meta tags - handled by proxy

Open Graph meta tags are now injected by the Cloud Run proxy
(All-Hands-AI/infra#886) which also removes Gradio's default
tags that were causing social media previews to show 'Gradio'
instead of 'OpenHands Index'.

Co-authored-by: openhands <openhands@all-hands.dev>

app.py

@@ -39,18 +39,6 @@ logger.info(f"All modules imported (LOCAL_DEBUG={LOCAL_DEBUG})")
 
 api = HfApi()
 LOGO_PATH = "assets/logo.svg"
-# Open Graph / Social Media Preview Meta Tags
-og_meta_tags = """
-<meta property="og:title" content="OpenHands Index" />
-<meta property="og:description" content="A Holistic Benchmark for Software Engineering" />
-<meta property="og:image" content="https://index.openhands.dev/file/assets/openhands-index-preview.jpg" />
-<meta property="og:url" content="https://index.openhands.dev" />
-<meta property="og:type" content="website" />
-<meta name="twitter:card" content="summary_large_image" />
-<meta name="twitter:title" content="OpenHands Index" />
-<meta name="twitter:description" content="A Holistic Benchmark for Software Engineering" />
-<meta name="twitter:image" content="https://index.openhands.dev/file/assets/openhands-index-preview.jpg" />
-"""
 
 # JavaScripts
 scroll_script = """
@@ -260,7 +248,7 @@ logger.info("Creating Gradio application")
 demo = gr.Blocks(
     theme=theme,
     css=final_css,
-    head=og_meta_tags + scroll_script + redirect_script + tooltip_script,
+    head=scroll_script + redirect_script + tooltip_script,
     title="OpenHands Index",
 )