Resolve dependency with legacy Bluetooth library

[RedCarrottt]

As shown in README.md, this project is dependent on legacy Bluetooth library(bluez).

It is because linux-side Bluetooth adapter uses SDP to communicate with bluez.

However, nowadays, it uses d-bus for IPC with bluez.

Due to this dependency, users using recent bluez should edit systemd config file every time they want to install this project.

This problem should be resolved for convenience to maintain.