Custom config file path

[leviskay]

Title: Implement -c Flag for Custom Config File Path in qmk-hid-host

Body:

I suggest introducing a -c flag in qmk-hid-host to enable specifying a custom configuration file path. Current behavior forces the use of qmk-hid-host.json from a default location.

Proposal:

• Add -c flag functionality to qmk-hid-host.

Expected Behavior:

• With qmk-hid-host -c /custom/path/config.json, utilize the configuration file at the specified path.
• Without -c, retain existing behavior, seeking qmk-hid-host.json in its default location.

Advantages:

• Enhances flexibility for configurations, particularly for users with multiple setups.
• Streamlines working with third-party keyboards by allowing easier config adjustments.
• Facilitates adding qmk-hid-host to system startup routines by offering straightforward path customization.

This addition is poised to significantly improve qmk-hid-host's functionality, catering to diverse user needs.

Best,

leviskay from ergohaven community