Add auto-scrolling option

[ButterbretzelChan]

Hey, I wasn’t able to read too much into the architecture of this project yet so I don’t know if this would be possible/easy to do but I’d really appreciate having the option to start some sort of auto-scroller when viewing posts so I can look at gay cats having intercourse while doing other things that require both hands like filing taxes or playing the piano :3 (similar to EhPanda, Anime boxes etc.)