Allow all origins for serverActions in v2

packages/gitbook-v2/open-next.config.ts

@@ -28,9 +28,7 @@ const config = {
 
     experimental: {
         serverActions: {
-            allowedOrigins: process.env.GITBOOK_URL
-                ? [new URL(process.env.GITBOOK_URL).hostname]
-                : [],
+            allowedOrigins: ['*'],
         },
     },
 };