Issues with fixed elements (update docs) about asscroll

[LeoSeyers]

And fixed elements inside won't work properly either. It make sense to pull them out obviously but other people will likely have this issue if it's not documented.

<nav style="position:fixed;"></nav>
<div class="asscroll-container"> 
  <div class="asscroll-inner"> /* y translation is applied to this first div insider the container */
    <main> /* content /*</main>
    <footer></footer>
  </div>
</div>

[ashthornton]

Fixed in 4934cf1