Alert about that WiFi should be connected when attempting to scan.

[TechWizEric]

If WiFi is not connected and the user attempts to use the "scan for server"-functionality, alert the user that WiFi should be connected for this function to work.

See also #10

[TechWizEric]

Team review - actions to be taken:

NB! there might be other connection types, like VPN (see #10).

• Investigate and implement.
• Time: 0.5 d