added dark mode

Signed-off-by: Dipankar Das <65275144+dipankardas011@users.noreply.github.com>

hugo.toml

@@ -145,7 +145,7 @@ navbar_translucent_over_cover_disable = false
 sidebar_menu_compact = false
 # Set to true to hide the sidebar search box (the top nav search box will still be displayed if search is enabled)
 sidebar_search_disable = false
-
+showLightDarkModeMenu = true
 # Adds a H2 section titled "Feedback" to the bottom of each doc. The responses are sent to Google Analytics as events.
 # This feature depends on [services.googleAnalytics] and will be disabled if "services.googleAnalytics.id" is not set.
 # If you want this feature, but occasionally need to remove the "Feedback" section from a single page,