This is very confusing as seen in #12974 or #12906. My suggestion would be "legacy."
console.log();
  console.log("### Creating web site");
  rimraf.sync(GH_PAGES_DIR);
  
  return merge([
    vfs
      .src(GENERIC_DIR + "**/*", { base: GENERIC_DIR, stripBOM: false })
      .pipe(gulp.dest(GH_PAGES_DIR)),
    vfs
      .src(GENERIC_ES5_DIR + "**/*", { base: GENERIC_ES5_DIR, stripBOM: false })
      .pipe(gulp.dest(GH_PAGES_DIR + "es5/")),
    gulp
      .src("test/features/**/*", { base: "test/" })
      .pipe(gulp.dest(GH_PAGES_DIR)),
    gulp
      .src(JSDOC_BUILD_DIR + "**/*", { base: JSDOC_BUILD_DIR })
      .pipe(gulp.dest(GH_PAGES_DIR + "api/draft/")),
  ]);
});
gulp.task("wintersmith", function (done) {
  var wintersmith = require("wintersmith");
  var env = wintersmith("docs/config.json");
  env.build(GH_PAGES_DIR, function (error) {
    if (error) {
      done(error);
      return;
    }
    replaceInFile(
      GH_PAGES_DIR + "/getting_started/index.html",
      /STABLE_VERSION/g,