This commit introduces the foundational user-facing chatbot interface.
- Adds a new `ChatbotPage` component with a complete UI for displaying messages, user input, and a simulated bot response.
- Implements a "typing" indicator for a better user experience.
- Integrates `react-router-dom` to handle application routing, directing the root path to the new chatbot and moving the admin login to `/admin`.
- Adds `react-icons` as a new dependency for UI elements.
- Extends Tailwind CSS theme with new colors and adds custom CSS for the typing animation.
