Minify js file, code spliting wasm file

[xuanlongvts]

hi there,

At the example router. https://github.com/yewstack/yew/tree/master/examples/router

when i run trunk serve --release, we are going to analytic all file.

1. index-2e4e699b9f23b3d5.css ---> 281 bytes. Good, because it had minified.
2. router-9cf6e0ee56e824f9.js ---> 35 kb. Not good, it hadn't minified.
3. index.html ---> 2 kb. Not good because it hadn't minified.
4. router-9cf6e0ee56e824f9_bg.wasm ---> 388 Kb. It too big, if our application develop over time, it can reach more than 2 Mb, 5 Mb, even more large.

Solution like that: https://reactjs.org/docs/code-splitting.html

Thanks!