Support `prefers-color-scheme` CSS media query

[JammyDodger]

我们已经有了自动暗黑模式功能一段时间了。

Automatic Dark Mode color scheme switching

You can now set up your Discourse site to automatically switch color schemes when the user’s device is in dark mode. For a quick preview, head over to the try.discourse.org instance and toggle your device’s dark mode on and off to see this new feature in action. (This feature not enabled on meta.) Enabling automatic dark mode To enable this feature on your instance, you can pick the dark mode color scheme in your site settings: [image] Once that setting is set, you can reload your site with …