feat: Add dark/light theme toggle to documentation website

Implements Material theme palette toggle with three modes:
- Automatic mode (follows system preference)
- Light mode (default scheme)
- Dark mode (slate scheme)

Users can now toggle between themes using the icon in the header.
All modes preserve the existing deep orange primary and green accent colors.

Closes #2444

Author: Subham-KRLX

mkdocs.yml

@@ -178,8 +178,31 @@ theme:
   name: 'material'
   custom_dir: docs-overrides
   palette:
-    primary: 'deep orange'
-    accent: 'green'
+    # Palette toggle for automatic mode
+    - media: '(prefers-color-scheme)'
+      toggle:
+        icon: material/brightness-auto
+        name: Switch to light mode
+      primary: 'deep orange'
+      accent: 'green'
+
+    # Palette toggle for light mode
+    - media: '(prefers-color-scheme: light)'
+      scheme: default
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+      primary: 'deep orange'
+      accent: 'green'
+
+    # Palette toggle for dark mode
+    - media: '(prefers-color-scheme: dark)'
+      scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to system preference
+      primary: 'deep orange'
+      accent: 'green'
   favicon: image/sedona_logo_symbol.png
   logo: image/logo.svg
   icon: