Client-side JS with Nim

[xigoi]

You don't need to use Karax. Nim can be compiled to JavaScript, with access to 
the DOM API using the [dom](https://nim-lang.org/docs/dom.html) module. Then 
you serve the generated JavaScript file the same way as if you wrote it 
yourself. That said, Karax probably has a more streamlined way to do this, I 
don't have that much experience with it.