🎨 remove Fullscreen button from editor toolbar (#714)
🎨 remove Fullscreen button from editor toolbar (#714)

closes https://github.com/TryGhost/Ghost/issues/8480

- removes fullscreen button from toolbar but keeps the "fullscreen" routines so that styling and other behaviour doesn't need to be updated
- side-by-side toggle now toggles fullscreen on/off (previously only toggled fullscreen on)
TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost