sitewide - redsign site with dark mode theme

![Image](https://github.com/user-attachments/assets/855f4c8f-ed32-4d03-a80b-00bd65f42cbd)
![Image](https://github.com/user-attachments/assets/cdd7b688-a8d4-4f16-ab61-7c4f82e0750e)
![Image](https://github.com/user-attachments/assets/349af504-db83-42ce-8fd4-2472d5934fc6)
![Image](https://github.com/user-attachments/assets/4507c72d-bcdc-4863-9b79-8ce053d8fb87)