fix: remove functions configuration from vercel.json

vercel.json

@@ -1,10 +1,5 @@
 {
 	"$schema": "https://openapi.vercel.sh/vercel.json",
 	"bunVersion": "1",
-	"installCommand": "bun install",
+	"installCommand": "bun install"
-	"functions": {
-		"api/**/*.ts": {
-			"runtime": "bun"
-		}
-	}
 }