feat(theme): dark theme detection

packages/website/unocss.config.ts

@@ -1,9 +1,14 @@
-import { defineConfig } from 'unocss';
+import presetWebFonts from '@unocss/preset-web-fonts';
+import { defineConfig, presetUno } from 'unocss';
 
 export default defineConfig({
-	theme: {
-		fontFamily: {
-			mono: ['JetBrains Mono'],
-		},
-	},
+	presets: [
+		presetUno({ dark: 'media' }),
+		presetWebFonts({
+			provider: 'google',
+			fonts: {
+				sans: 'JetBrains Mono',
+			},
+		}),
+	],
 });