docs: Manage system color scheme changes (#2440)

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

Before:

https://github.com/user-attachments/assets/59db2476-31a0-4a86-b04f-91239b4af51e

After:

https://github.com/user-attachments/assets/21a65e4b-826d-4c70-9fdb-8498e891fb75
(cherry picked from commit 5b9b8bd)

Author: patrycjakalinska

docs/docusaurus.config.js

@@ -46,6 +46,9 @@ const config = {
         { name: 'og:image:width', content: '1200' },
         { name: 'og:image:height', content: '630' },
       ],
+      colorMode: {
+        respectPrefersColorScheme: true,
+      },
       navbar: {
         hideOnScroll: true,
         logo: {