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/load-content.js

@@ -0,0 +1,12 @@
+"use strict"
+
+const readCache = require("read-cache")
+const dataURL = require("./data-url")
+
+module.exports = filename => {
+  if (dataURL.isValid(filename)) {
+    return dataURL.contents(filename)
+  }
+
+  return readCache(filename, "utf-8")
+}