Removed animation from page content.
Removed animation from page content.

Prevents issues with browsers that do not support
animaton-fill-direction.
Fixes #173.

oomba/the-loud-cartographer,oomba/the-loud-cartographer,oomba/the-loud-cartographer,Abijeet/BookStack,BookStackApp/BookStack,Abijeet/BookStack,Abijeet/BookStack,BookStackApp/BookStack,BookStackApp/BookStack