chore: remove unused Vercel ignoreCommand

apps/developer-hub/vercel.json

@@ -1,5 +1,4 @@
 {
   "$schema": "https://openapi.vercel.sh/vercel.json",
-  "ignoreCommand": "../../vercel-ignore.sh",
   "buildCommand": "turbo run build:vercel --filter @pythnetwork/developer-hub"
 }