Considering add comments to webui App.vue file

Hello!

I’m new to Vue.js and also to concept of routing. It took me some time to realize that strings

    div.container.aw-container.my-3.py-3
        error-boundary
            router-view

are responsible for main contents display. Is it worth adding some comments like

     // This part is responsible for page's main contents
     // see ./route.js for details

?

Maybe it’ll be useful for somebody…

I can make a PR.

Sounds good to me, feel free to make a PR!