chore(website): prefer os theme

Author: ggurkal

website/docusaurus.config.js

@@ -67,7 +67,8 @@ module.exports = {
       copyright: `Copyright © ${new Date().getFullYear()} <a href="https://instantcommerce.io" target="_blank" rel="noopener">Instant Commerce<a/>.`,
     },
     colorMode: {
-      defaultMode: 'dark'
+      defaultMode: 'dark',
+      respectPrefersColorScheme: true
     }
   },
   presets: [