This fixes issues where users may somehow add an https mapping but are missing an ssl certificate, causing nginx to not load properly. We now ignore the mapping and warn users of the misconfiguration.
Closes#5368
This makes the installation a bit more secure by ensuring a user does not accidentally expose a way for unauthorized users to add new ssh keys to the system.
Additionally, this removes the extra HOSTNAME file to make the initial install process easier (that file was not modifiable by any dokku commands.
Closes#2247
