Notify the end-user if a Dnsmasq configuration already exists

[Serializator]

Problem
Whilst installing Jale onto the machine of a colleague I experienced an issue with Dnsmasq. Dnsmasq wasn't starting properly because of an already existing configuration file for Dnsmasq, left behind by Valet+.

It contained a reference non a non-existing configuration file, causing Dnsmasq not to work properly but still shown as "Started" (in green) when using brew services list.

Suggestion
Notify the end-user whilst installing / configuring Dnsmasq if a configuration file already exists.