add/move to the side, right and left navigation button

[marcarc]

Hi!
I was wondering, if there is an option, to add, or move the navigation (right & left) buttons on the side, instead of at the button in the toolbar, like that:

Or should I just override the "toolbar" CSS and move the buttons? Or any better ideas?

Thank you for your reply :)

[fengyuanchen]

See #461.