Let canvas preview options at top bar in baklava.design website (background dark-light, grid preview etc.) be invisible when it is not needed

[maxkonrad]

IDK, if it is a bug. But in baklava website background preview, grid preview and outline preview on top bar is visible also in documentation section, despite they have no functionality. If they have functionality, there might be a bug because it doesn't work on my Firefox 112.02 for Ubuntu.

In order to keep it clean, these options can be visible only in canvas.