Add pagignation & js rendered infinite scroll experiment.

[M3TIOR]

I want to add a pagified experiment with a javascript toggle button for infinite scroll functionality. The javascript infinite scroll toggle should be implemented as a library and contain settings for both the on/off toggle and render style toggle. Render style will have two immediate options: cache-all, or a number representing the amount of page instances to cache before clearing the opposite scroll direction's last cached element.