Function no_color 

pub fn no_color() -> bool

Detect if NO_COLOR environment variable is set.

When set, all colorization should be disabled regardless of theme settings. This follows the standard: https://no-color.org/

Example

use netspeed_cli::terminal::no_color;

if no_color() {
    println!("Plain output");
} else {
    println!("Colorized output");
}