Installer should warn user if they try to install on a 32bit version of OS.

[ryanneve]

Describe the bug If a user tries to install BirdNET-Pi on a 32 bit version of the OS, the error message is somewhat cryptic. See #847

To Reproduce Run curl command on 32 bit version of Raspbian.

Expected behavior A clearer error message.

Additional context The instructions clearly state that this need to be a 64bit install, but some people might try to add BirdNET-Pi to an existing 32 bit system and skip that set.

Your build Pi4 with LiFePO4wered and Pi-plates RelayPlate2