Add UI for reading one paragraph at a time

[ajtran303]

Right now readers just scroll down to complete a chapter.

It would be cool if instead, they could have some horizontal navigation to interact with on a frequent basis, just like turning pages.

I can imagine reading one paragraph at a time or N amount of lines. There is a button to read the next "section" which will then show that new section and hide the old one.

There should also be a button to go back.