Design handheld backend

[CyberSamurai0]

Ensure constant availability and near-real-time refresh rate so that the frontend can render positions accordingly.

• Expose http://localhost/json to output loc_north, loc_east, building_id, and floor as a JSON object.
• Automatically retrieve calculated position from Bleak and write to the Position class instance
• Verify that the endpoint is never being cached by the browser