update base

Updates base. 3 significant changes:
- Semibold -> bold
- All links inside dark containers are either white or gray. The priority on some elements feels a little off, and some things that used to look like links, now don't as much. This was a change i made to make .dark more versatile at the expense of not quite being as nice against true dark/black backgrounds. 
- Font is now an icon font and so inherits text color. This leads to more predictable icon colors, which also means some icons are now colored differently than they once were.

That said, I think this upgrade comes with some improvements, like some new/polished UI components, and doesn't introduce any real usability issues or breaking changes.