reconfigure css to allow consumer styling

It's a little jank, but it works. The consumer absolutely MUST have a
file at `$lib/styles/tailwind.css` that contains all necessary tailwind
imports AND also imports the `src/lib/styles/base.css` file from sui.

WILL address this in another commit.

src/app.css

@@ -1,3 +1,3 @@
-@import '$lib/styles/theme.css';
+@import '$lib/styles/tailwind.css';
 
 @custom-variant dark (&:where(.dark, .dark *));