Feature Request: Ability to hide the left icons and profile photo.

It would be nice if we could hide the icons on the left bar and the profile photo. When we hover over it with the cursor, it will be visible again. 

This can be added to the options. 

I tried to do it myself with CSS and unfortunately I failed. Yes, maybe it's too easy. It was probably easy. But it would be nice to have it as a feature anyway.