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.

package.json

@@ -26,7 +26,8 @@
 		".": {
 			"types": "./src/lib/index.ts",
 			"svelte": "./src/lib/index.ts"
-		}
+		},
+		"./styles": "./src/lib/styles/base.css"
 	},
 	"peerDependencies": {
 		"@sveltejs/kit": "^2.20.2",