Implement mDNS to assign a .local dns name

[Ezward]

See https://floatingintheclouds.com/espmdns/

See EloquentEsp32 example https://github.com/eloquentarduino/EloquentEsp32cam/blob/main/src/traits/HasMDNS.h

Multicast DNS is a protocol that allows a device to register a DNS name on the local network. This makes it easy to find your device even if you don't know the IP address. You can define a name, like myespcam and it will show up on the network as myespcam.local. That would allow us to access the robot application on http://myespcam.local:8080