What is the correct way to write a Procfile for a django app when deploying an app to heroku?

Question

Django

I need that when the user launches the site, immediately after executing python manage.py runserver, he opens a page with the url /app, and not /, so that there is no 404 error.
How can I write this in a Procfile? And what is the difference between web, worker, urgentworker, clock process types? (Couldn't find it in the documentation)