Documentation for aliases

[dehnhard]

Describe the bug

Missing documentation of /etc/maddy/aliases.

Steps to reproduce

I followed the tutorial to setup a simple personal mail server. It was easy and straightforward. Just the needed mail aliases took a long time to setup, because it was not documented and a search brought me at first to some complex setup descriptions. Eventually I found a mention of the aliases file in some PR or commit message.

Log files

n/a

Configuration file

n/a

Environment information

• maddy version: 0.7.1

A sentence about /etc/maddy/aliases at the end of the tutorial and/or an example file for e.g. an alias hostmaster would be nice for newcomers.