a11y: Implement the new design
Implement the new a11y panel design https://gitlab.gnome.org/Teams/Design/settings-mockups/-/blob/master/a11y/a11y-wires.png
Implement the new a11y panel design https://gitlab.gnome.org/Teams/Design/settings-mockups/-/blob/master/a11y/a11y-wires.png