Subtle changes, bugs and feedback

Let me share the original CSS building stuff later, you can adjust whatever you wish to make a dark theme. If it works for multiple sites then I'll make it available based on device setting (dark mode device would get dark mode site).

There switching is easy, making a decent dark mode CSS that works for different site branding is hard. If you've done a chunk of that then let's use that.

Edit: @snottyotter https://github.com/microcosm-cc/microweb-bootstrap that's what you need.