Virtual scrolling

Normally posts which aren't being displayed anymore are still being rendered.

Having a virtual scroller would make the site appear smoother by only rendering posts which are being scrolled though and removing elements from the DOM which currently aren't displayed.

There already is a module vue called vue-virtual-scroller and here is a demo of it in action https://akryum.github.io/vue-virtual-scroller/#/dynamic

Maybe it could prevent that I sometimes see the background image instead of the timeline if I scroll the timeline on my phone very fast