feature request: Update <title> with the hex code of the colours

At the outset, thanks so much for this tool! ✨ 

As I'm going through the various random ones here, I'm bookmarking them for later use. The permalinks are really useful for this.

The one thing I'd _like_ to have is that the title be automatically updated with the hex colours so that the bookmark become unique

Thanks once again for this, Brent.