This diff introduces a new component that wraps the contents of the App component, and the job of this component is to update the data attribute based on what the activeTheme of the app is. The subsequent diff will introduce the css variable list that will use this data attribute to show dark or light mode color values
Sources I used to help me with this implementation:
https://css-tricks.com/easy-dark-mode-and-multiple-color-themes-in-react/
https://stackoverflow.com/questions/56300132/how-to-override-css-prefers-color-scheme-setting