== Background
This ticket will track the release of dark mode as a beta feature on desktop across wikis.
== User story
- As a logged-in user, I want the ability to opt into dark mode as a beta feature, so that I can quickly benefit from the feature and test the new feature before wider release
== Requirements
[] Dark mode must be packaged with the current "Accessibility for reading" beta feature, which enables the appearance menu and its functionality
[] Upon deployment, the dark mode option will be made available in the appearance menu
[] Selecting dark mode will switch the interface to dark mode
[] The default setting for the dark mode option will be "light"
== Design
- see subtasks
== Acceptance criteria
[] Ensure all requirements are complete
[] Check with @ovasileva and @sgrabarczuk before deployment
== Communication criteria - does this need an announcement or discussion?
[] An cross-wiki announcement of the deployment must be prepared ahead of deployment and ready to post