Support for a dark theme

I am sorry @odd1 I cannot accept this contribution in Utopian. It is against the Utopian rules https://utopian.io/rules

Ideas/Feature requests Category
Contributions submitted under this category are the most important ones, therefore they must provide as much details as possible. Ideas and feature requests must be well explained and in great details. They must include images or videos and include any necessary information for the idea/feature to be created.

[utopian-moderator]

It's alright. I thought ideas was like github issues. I'm still getting the hang of this..