feat: scaffold build script

crates/tuono_lib/src/ssr.rs

@@ -3,9 +3,11 @@ use std::cell::RefCell;
 use std::fs::read_to_string;
 
 pub struct Js;
+
 impl Js {
     thread_local! {
         pub static SSR: RefCell<Ssr<'static, 'static>> = RefCell::new(
+              // TODO: handle here dev/prod source
                 Ssr::from(
                     read_to_string("./.tuono/server/dev-server.js").unwrap(),
                     ""