fix(RenderBodyContent): make renderBodyContent ssr-friendly

[Pistch]

Problem is that if you use app-layout to render SSR pages, it does not rehydrate properly because of additional whitespaces present inside div tag for root node.

App-layout produces:

<div id="root">
    <div>app content</div>
</div>

React.hydrateRoot() expects:

<div id="root"><div>app content</div></div>