Remove Engine API link from header navigation

Co-authored-by: samina <samina@thirdweb.com>

Author: cursoragent

apps/portal/src/app/Header.tsx

@@ -123,10 +123,6 @@ export const connectLinks: Array<{
 ] as const;
 
 const apisLinks = [
-  {
-    href: "https://engine.thirdweb.com/reference",
-    name: "Engine",
-  },
   {
     href: "https://insight.thirdweb.com/reference",
     name: "Insight",