Cleanup: two system files inherited from the previous installation removed

A sudo rule targeting a deleted account and a log rotation targeting a removed service were taken out. The sudo and logrotate configuration remains valid.

sudo rule: allowed a former (deleted) system account to start, stop and restart the ac-authserver and ac-worldserver services. Useless, and risky: an account recreated under that name would have inherited control of the new server's services.
Log rotation: targeted the old website's logs and a deleted user; it would have failed if files had reappeared.
Checks after removal: visudo -c without errors, logrotate -d dry run without errors.
A copy of both files exists in the previous version's archive.