update readme to reflect env vars being set in the manage script

panel/README.md

@@ -56,8 +56,4 @@ The Fediversity Panel is a web service for managing Fediversity deployments with
 
 - Use the [Django Debug Toolbar](https://github.com/django-commons/django-debug-toolbar) for troubleshooting in the browser
 
-When deployed, `manage` may be accessed like:
-
-```sh
-sudo DATABASE_URL=sqlite:////var/lib/panel/db.sqlite3 manage
-```
+When deployed, `manage` may be accessed from the root user.