Dark Mode for DOCS.

[timscodebase]

Feature Request

• Is your feature request related to a problem? Please describe clearly and concisely what is it.

I have mental heath problems that make Black on White color schemes physically painfully. I would be happy to looking into doin it myself. I feel strongly that all site should have a dark mode opption

• Describe the feature you would like, optionally illustrated by examples, and how it will solve the above problem.

Dark mode on site and docs

• Does it break backward compatibility, if yes then what's the migration path? no

In case this proposal includes a substantial change to the language, we ask you to go through an RFC process.

The best place to start an open discussion about potential changes is the Crystal forum.