Implement mDNS to create a frog.local/ local web address

[keenanjohnson]

In #7 we are exploring the start of building a local device interface for the Frog Sensors.

Instead of asking the user to identify the device's local IP address to navigate to that page, we should attempt to integrate mDNS or some similiar technology so that the user can type something like "frog.local/" into their browswer and be directed to the device's page. Reference.

Several other IoT projects do this, so it seems possible, though maybe more difficult on an esp32 vs a full single board computer like a raspberry pi.

• Octoprint
• https://github.com/just4give/birdwatcher/blob/f83a4483cfd1a0a5e8ecf70f57a27e1be003d763/docker-compose.yml#L57