[FEATURE] Improve Landing Page UI and Dark mode

### 💡 Is your feature request related to a problem?
Current UI of the Landing page looks old and the Dark mode is not optimized for the page

### 🌟 Describe the solution you'd like
will update whole UI of landing page and fix the dark mode issue due where the page is not user-centric in darkmode

### 🚀 Additional context

i would like to work on this issue @anditisyou
thank you