Serve static files at root; add ColorPicker README

- Change FileServer base path to “/” to serve static assets from the
  site root.
- Remove the unused helloHandler route registration.
- Add README documentation for the new ColorPicker web component.

cmd/app/main.go

@@ -16,21 +16,15 @@ func main() {
 	r.Use(middleware.Recoverer)
 
 	// Register the hello world handler at the root path
-	r.Get("/", helloHandler)
 
 	// Serve static HTML files from the "static" directory
 	// (e.g., /static/index.html will be accessible at /static/index.html)
-	FileServer(r, "/static", http.Dir("./static"))
+	FileServer(r, "/", http.Dir("./static"))
 
 	// Start the HTTP server
 	http.ListenAndServe(":8080", r)
 }
 
-// helloHandler responds with a simple "Hello, World!" message.
-func helloHandler(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte("Hello, World!"))
-}
-
 // FileServer sets up a http.FileServer handler for serving static files.
 func FileServer(r chi.Router, publicPath string, root http.FileSystem) {
 	if publicPath == "" {