feat: add sidebar animation #1021
Adds an animation to the sidebar upon expanding or collapsing and fixes the "white border issue" caused by the transition on the bottom border. I deemed the fading out and in necessary since there is no proper way to transition the flex-direction property.
Types of changes
With the identicons visible it just doesn't look smooth and good. The change of the height and the bottom border makes the transition rather clunky. A positive sideeffect of this approach is also that the transition is only applied to the parent container and not to every single menu Item.