Removing book animations (at least on mobile)

[grantmcconnaughey]

The book animations are neat, but I think removing them should be considered, at the very least on mobile.

On a mobile device, they break the layout and slow scrolling to a grinding halt. Now that links to the books are included for each book (via the orange book title header) there is no more need to include the "More Info" link.

On desktop I don't have a huge problem with them, except for maybe that the book cover is hidden when the book opens. There aren't really any performance issues I've noticed, though.

@glaforge and @melix, what are your thoughts?

[melix]

It's not that slow on my mobile, so I didn't notice, but yes, I agree that they should be disabled on mobile devices.

[glaforge]

We could probably try and see if we can remove the animation under a certain screen size.
Perhaps under 768px where the description of the book goes below the book itself.

[grantmcconnaughey]

Submitted a PR for this.

[glaforge]

Thanks!