Build tool for the Leptos web framework.

Features
- Parallel build of server and client in watch mode for fast developer feedback
- CSS hot-reload (no page-reload, only CSS updated)
- Build server and client for hydration (client-side rendering mode not
  supported)
- Support for both workspace and single-package setup
- SCSS compilation using dart-sass
- CSS transformation and minification using Lightning CSS
- Builds server and client (wasm) binaries using Cargo
- Generates JS - Wasm bindings with wasm-bindgen
- Optimises the wasm with wasm-opt from Binaryen