Remove potential existing pkg dir from a previous build
Remove potential existing pkg dir from a previous build

Not doing so outputs the unpleasant following, which may or may not be an issue. Either way, it should start fresh.

```sh
ln: failed to create symbolic link ‘/home/user/deb-lounge/pkg/lib/systemd/system/multi-user.target.wants/lounge.service’: File exists
mkdir: cannot create directory ‘/home/user/deb-lounge/pkg/DEBIAN’: File exists
mkdir: cannot create directory ‘/home/user/deb-lounge/deb’: File exists
```

thelounge/deb-lounge