remove gulp and Node dependencies

CSS is now handled by SASS via IDE plugin (watchsass),
Node/gulp build pipeline is no longer needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gulpfile.mjs

@@ -1,36 +0,0 @@
-import gulp from "gulp"
-const { watch, parallel, src, dest } = gulp
-import cssnano from "gulp-cssnano"
-import autoprefixer from "gulp-autoprefixer"
-import cssimport from "gulp-cssimport"
-import babel from "gulp-babel"
-
-function cssProcess() {
-  return src("assets/css/style.css")
-    .pipe(cssimport())
-    .pipe(
-      autoprefixer({
-        cascade: false,
-      })
-    )
-    .pipe(cssnano())
-    .pipe(dest("assets/dist"))
-}
-
-function jsProcess() {
-  return src("assets/js/script.js")
-    .pipe(
-      babel({
-        presets: ["@babel/env"],
-      })
-    )
-    .pipe(dest("assets/dist"))
-}
-
-function dev() {
-  watch("assets/css/src/*.css", cssProcess)
-}
-
-const build = parallel(cssProcess, jsProcess)
-
-export { dev, build }

package.json

@@ -1,11 +0,0 @@
-{
-  "devDependencies": {
-    "@babel/core": "^7.23.9",
-    "@babel/preset-env": "^7.23.9",
-    "gulp": "^4.0.2",
-    "gulp-autoprefixer": "^9.0.0",
-    "gulp-babel": "^8.0.0",
-    "gulp-cssimport": "^7.0.0",
-    "gulp-cssnano": "^2.1.3"
-  }
-}