[Change Request] Do not use hgroup

[AmiralBl3ndic]

Hello.
First of all, thanks for the amazing product, it is a breeze to use for prototyping applications!

I am using the hgroup tag for grouping heading tags together as explained in the documentation but something bugs me: hgroup is not an HTML5 standard.
This is problematic because it makes using it very complicated with Vuejs for example: using hgroup with Vue + Vite results in build errors (TS2604).

Maybe for this specific use case it could be better of using non purely semantic but instead relying on classes?

i.e., this:

<hgroup>
    <h1>Hello</h1>
    <h2>World</h2>
</hgroup>

could become this:

<div class="headings">
    <h1>Hello</h1>
    <h2>World</h2>
</div>

Thanks again! 🚀

[lucaslarroche]

Also solves #32