Improving the config handling

[JojiiOfficial]

Currently, the config has to be at the exact same location as the executable, this bring some problems and is generally not the best way to handle configs. You can't install the binary in /usr/bin and use clink as user, because /usr/bin is not writable as user. Also users probably want their own configuration each. I'd place the configuration in ~/.config/clink/clink.toml. In addition a cli flag like -c or --config would help as well.

[Lurk]

I think that is a good idea. I will do it sometime later, or feel free to make a pull request.