Fix compose file for Authentik

[sahara101]

Hello Jim,

- "traefik.http.services.authentik.loadbalancer.server.scheme=https" 

does not work, we would receive the error 500 Internal Server Error error="tls: first record does not look like a TLS handshake"

I changed from https to http since Authentik responds to http over port 9000.

Thanks!