Reduces contrast and brightness of images when the dark theme is active.
Useful when invertable-image is not appropriate (photographs, paintings,
colour drawings…)
Update the theme switcher code to set the default theme to the OS
default, rather than the "light" theme. This provides a more seamless
user experience for users whose OS is set to a dark mode. The current
theme setting in local storage will still be respected if present. This
change was made to improve the accessibility and usability.
Fixes#38
welpo