fix(performance): remove OpenAI preconnect and trailing whitespace

Signed-off-by: Harshit Kumar <10harshitkumar@gmail.com>

Author: 23harshitkumar

index.html

@@ -37,9 +37,8 @@
       href="https://fonts.googleapis.com/css2?family=Rubik:wght@300..900&display=swap"
       rel="stylesheet"
     />
-    
+
     <!-- Performance hints for AI provider APIs -->
-    <link rel="preconnect" href="https://api.openai.com" crossorigin />
     <link rel="dns-prefetch" href="https://api.openai.com" />
     <link rel="dns-prefetch" href="https://api.anthropic.com" />
     <link rel="dns-prefetch" href="https://generativelanguage.googleapis.com" />