docs: function headless(callback) {
    browserSync.init({
      server: {
        baseDir: "./docs"
      },
      open: false
    });
    watch("src/sass/**/*.scss",{ ignoreInitial: false }, compileSass);
    watch("src/js/**/*.js", { ignoreInitial: false }, compileJS);
    watch("src/index.html", { ignoreInitial: false }, compileHTML);
  
    callback();
  }