Use Super+N to switch workspaces

This should be easy to setup, but unfortunately:

1. Gnome Settings exposes only the first 4 workspaces in Keyboard Shortcuts.
2. Disabling the keyboard shortcuts in Ubuntu Dock (which also uses Super+N) doesn’t always unbind all of them.

So here goes:

gsettings set org.gnome.shell.keybindings switch-to-application-1 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-2 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-3 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-4 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-5 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-6 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-7 "[]"
gsettings set org.gnome.shell.keybindings switch-to-application-8 "[]"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-1 "['<Super>1']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-2 "['<Super>2']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-3 "['<Super>3']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-4 "['<Super>4']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-5 "['<Super>5']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-6 "['<Super>6']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-7 "['<Super>7']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-8 "['<Super>8']"