Redirect GCP Cloud Function to a Cusotm Domain

I'm looking to redirect my cloud function built with GCP and Firebase to the following address https://www.authentiic.com/blog-admin. I have created a VM within GCP if that's needed. The blog code is below, and I will grant GCP access after awarding the project. Here is where I can access it now
https://us-central1-authentiic-447de.cloudfunctions.net/app/blog-admin