make get_local_ip work offline and on hotspots

[wddler]

Hi,
Thanks for releasing this great project.
This requests fixes the issue of the original socket lookup to 8.8.8.8 failing in offline environments (I discovered it while running the project on a machine with a hotspot). Which resulted in

The phone web app should be available at https://Error: [Errno 101] Network is unreachable:4443

Please find the extended get_local_ip function in teleop/__init__.py where:

1. It attempts the standard 8.8.8.8 socket connection method if there is internet access.
2. If that fails, it falls back to parsing the Linux hostname -I command to fetch the local IP offline or while acting as a hotspot.
3. If both fail, it returns "127.0.0.1".