A11y review of the new dark-mode toggler implementation

[aristath]

After the discussion on #1 and a private chat with @afercia about what "the perfect toggler" would be from an a11y perspective, it was refactored but we'll need a final review of this, just to be sure we're OK for screen-readers and as an overall experience.

This should go through a final a11y check to make sure what was discussed was properly implemented. 🙇

[afercia]

Tested it and from an accessibility perspective seems a very good implementation to me.

A toggle button (i.e. a button with a state) is visually and semantically the simplest, most accessible solution. Tested with maor screen reader/browser combinations on Windows and macOS, Voice Control on macOS 👍

[aristath]

Perfect, thank you!
Closing this one 👍