Update docusaurus.config.js (#618)

Summary
This PR introduces automatic theme switching in Roo Code Docs, allowing the application to detect and apply the user's system color scheme preference (light or dark mode). This enhancement ensures a seamless and personalized user experience by aligning the documentation theme with the user's device settings.

Changes
Detects system color scheme preference using the prefers-color-scheme media query.
Automatically applies the light or dark theme based on the user's system settings.
Maintains existing manual theme selection as an override
Motivation
Many users prefer their apps and websites to match their device's appearance settings. By enabling automatic theme switching, we improve accessibility and user satisfaction without requiring manual configuration.

Author: sanathusk

packages/website/docusaurus.config.js

@@ -36,6 +36,11 @@ module.exports = {
       // Optional: path for search page that enabled by default (`false` to disable it)
       searchPagePath: "search",
     },
+    colorMode: {
+      defaultMode: 'light',
+      disableSwitch: false,
+      respectPrefersColorScheme: true,
+    },
     image: "img/ladle-baseweb.png",
     navbar: {
       title: "Ladle",