Feat: Add footer to landing page for contact information and project details

### 📝 Description

On the landing page where users can download the project, there is currently no footer section. Because of this, users do not have an easy way to contact the company, access social links, or learn more about the project and its contributors.

Adding a footer would improve usability, trust, and overall user experience.

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### 🎯 Why this is important

* Users cannot find contact or support information
* No quick access to company/project details
* Reduces credibility for first-time visitors
* Makes navigation incomplete on the landing page

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### ✅ Expected Behavior

The landing page should include a footer that contains:

* Contact information (email or support link)
* Social media or GitHub links
* Basic project or company information
* Optional: copyright notice

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### ❌ Current Behavior

* No footer is present on the landing page
* Users reach the end of the page with no additional navigation or information

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### 🔁 Steps to Reproduce

**To run the landing page locally:**

1. Open a terminal in the PictoPy project root folder
2. Navigate to the landing page directory:

```
cd landing-page
```
3. Start the development server:

```
npm run dev
```
4. Open the application in the browser
5. Scroll down to the bottom of the landing page
6. Observe that no footer section is present

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### 🖼️ Screenshots

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### 📌 Additional Information

* [x] I agree to follow this project’s Code of Conduct
* [x] I want to work on this issue

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### ✅ Checklist before Submitting

* [x] Have you updated docs for it?
* [ ] Have you added unit tests?
* [ ] Have you made sure unit tests pass?
* [x] Have you made sure code formatting is correct?
* [ ] Does it contain any style-related issues?