clean up consumer styling

Consumer now only imports the styles endpoint from their main CSS file.
Dark mode is currently permanently disabled, I need to add a JS helper
that when used automatically adds the correct class if there is a
preferred color scheme.

Also gets rid of the whole weird thing where the consumer had to have
a SPECIFIC `theme.css` file.

src/lib/styles/reference.css

@@ -0,0 +1,2 @@
+@import 'tailwindcss';
+@import './base.css';