Gulpify build pipeline (#3145)

* Gulpify build pipeline

* Update build frontend script

* Fixes

* Limit service worker to latest build

* Use shorthand

* Fix hassio build

build-scripts/gulp/clean.js

@@ -0,0 +1,5 @@
+const del = require("del");
+const gulp = require("gulp");
+const config = require("../paths");
+
+gulp.task("clean", () => del([config.root, config.build_dir]));