feat: implement build system and development workflow

- Add npm scripts for CSS/JS compilation (build:css, build:js, build)
- Create PowerShell build automation script
- Document development workflow in README
- Add troubleshooting guide for build issues
- Specify proper file structure and compilation process

Supports Tailwind CSS v3.4.0 and esbuild bundling with source maps.

node_modules/postcss-import/lib/join-layer.js

@@ -0,0 +1,9 @@
+"use strict"
+
+module.exports = function (parentLayer, childLayer) {
+  if (!parentLayer.length && childLayer.length) return childLayer
+  if (parentLayer.length && !childLayer.length) return parentLayer
+  if (!parentLayer.length && !childLayer.length) return []
+
+  return parentLayer.concat(childLayer)
+}