refactor: move nebula assets to hway build directory

cmd/hway/server.go

@@ -12,7 +12,6 @@ import (
 func main() {
 	s := echo.New()
 	s.Use(ctx.UseSession)
-
 	s.GET("/", routes.Home)
 	s.GET("/login", routes.LoginStart)
 	s.GET("/register", routes.RegisterStart)