docs: Manage system color scheme changes (#3181)

This PR introduces persistance between system color theme and user
selected color theme.

Before:


https://github.com/user-attachments/assets/6e4aa9c2-0183-4e60-88a8-1379de7fc0d6


After:


https://github.com/user-attachments/assets/ae14e907-9bf9-4cec-80c8-7a35b3ded9a5

Author: patrycjakalinska

docs/docusaurus.config.js

@@ -69,6 +69,9 @@ const config = {
         { name: 'og:image:width', content: '1200' },
         { name: 'og:image:height', content: '630' },
       ],
+      colorMode: {
+        respectPrefersColorScheme: true,
+      },
       navbar: {
         title: 'React Native Gesture Handler',
         hideOnScroll: true,