add dark theme option

[gravitypriest]

No description provided.

[aaroneiche]

I think the buttons visibility can be set in CSS like so:

body.dark #dark-button {
    visible: false; /* or alternatively; display:none */
}

[aaroneiche]

I like the addition of themes, I'd recommend instead of storing the property as darkThemeEnabled, store the value key as theme, then we can arbitrarily add themes to the project.

[gravitypriest]

Kept both buttons visible at all times, assuming that with the addition of more themes, there will be a row of theme selection buttons in the bottom left. Maybe a dropdown if it gets too long

[aaroneiche]

Looks great! 👍

[aaroneiche]

recommend an outline:none here to prevent the browser from giving the buttons an extra highlight when clicked.

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