[Feature]: add an option to turn of --classify

@zwpaper is already working on this.

Since Sep 28, 2023.

### Version

- [X] latest

### version

lsd 1.0.0

### What OS are you seeing the problem on?

Linux

### installation

NixOS

### term

_No response_

### ls-colors

_No response_

### What happened?

I have `lsd` configured with `indicators = true`. The indicators persist when `lsd` is used non-interactively, i.e it's output is piped.

```sh
$ mkdir -p test; cd test
$ touch foo; chmod +x foo
$ lsd | xargs rm
rm: cannot remove 'foo*': No such file or directory
$ lsd
 foo*
```

There should be no files remaining. Instead, `foo` was never removed.

### What expected?

We should be able to run `lsd --classify --indicator-style=none` and the two options would cancel each other out, showing no suffixes for special files. This would mirror the option in `ls`, the recommended way to turn off `--classify` according to https://superuser.com/a/220680

In general, each configurable setting that can be turned on with an option should have an option to turn it off.

### What else?

Another potential approach is to hide the classifiers when stdout is not a tty, maybe configurable by a setting? A downside is compatibility with `ls` would break.