Fix Landing Page

The landing page is still the default one as from shadcn(see image below). Create a simple-looking landing page which describes about the application in a neat manner.

<img width="1917" height="1031" alt="Image" src="https://github.com/user-attachments/assets/11a1f48e-bc2e-4d1c-9ddc-5f21d5b78f4d" />