docs: updated theme config to respect users' preferredd color scheme (#1973)(by @jewhyena)

* feat: respect users' preferredd color scheme

* feat: set default color mode to dark

---------

Co-authored-by: Eugene <91225197+jewhyena@users.noreply.github>

Author: xoyseau

website/docusaurus.config.ts

@@ -79,6 +79,12 @@ const config: Config = {
     // Replace with your project's social card
     image: 'img/preview.gif',
 
+    colorMode: {
+      defaultMode: 'dark',
+      disableSwitch: false,
+      respectPrefersColorScheme: true,
+    },
+
     navbar: {
       title: 'React Native Bottom Sheet',
       logo: {