[UI] `Landing Page` for Debate AI

## Describe the Issue

Currently the DebateAI FrontEnd lacks a landing page that describes the project and it's core functionalities

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## How to reproduce the issue?

```bash
cd frontend
```

- open localhost:5173
- checkout the current landing page.

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### What changes I want to make to solve this issue?

- I have made a simple UI design to give an insight about DebateAI
- Here's a the first draft that I have made using Figma


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Could you assign me this issue ?
@keshav-nischal