code: function modules() {
    // Bootstrap
    var bootstrap = gulp.src('./node_modules/bootstrap/dist/**/*')
      .pipe(gulp.dest('./vendor/bootstrap'));
    // Font Awesome
    var fontAwesome = gulp.src('./node_modules/@fortawesome/**/*')
      .pipe(gulp.dest('./vendor'));
    // jQuery Easing
    var jqueryEasing = gulp.src('./node_modules/jquery.easing/*.js')
      .pipe(gulp.dest('./vendor/jquery-easing'));
    // jQuery
    var jquery = gulp.src([
        './node_modules/jquery/dist/*',
        '!./node_modules/jquery/dist/core.js'
      ])
      .pipe(gulp.dest('./vendor/jquery'));
    // Simple Line Icons
    var simpleLineIconsFonts = gulp.src('./node_modules/simple-line-icons/fonts/**')
      .pipe(gulp.dest('./vendor/simple-line-icons/fonts'));
    var simpleLineIconsCSS = gulp.src('./node_modules/simple-line-icons/css/**')
      .pipe(gulp.dest('./vendor/simple-line-icons/css'));
    return merge(bootstrap, fontAwesome, jquery, jqueryEasing, simpleLineIconsFonts, simpleLineIconsCSS);
  }
docs: Bring third party dependencies from node_modules into vendor directory