Added footer in Sell Car Page

[MEHWISH310]

Which issue does this PR close?

• Closes Footer Missing on Sell Car Page #949

Rationale for this change

The Sell Car page did not have a footer section, which resulted in inconsistent layout and limited navigation compared to other pages of the website. Adding a footer ensures uniformity in design, enhances navigation, and provides users with quick access to important links and contact information.

What changes are included in this PR?

• Added a responsive footer section to the Sell Car page.
• Matched styling, layout, and content with the existing footer used across other pages.
• Included key navigation links, contact details, and social media icons.
• Ensured proper alignment and responsiveness on all screen sizes.
• Verified dark/light mode compatibility for visual consistency.

Are these changes tested?

Yes, the footer section was tested manually to confirm that:

• It displays correctly across devices and screen sizes.
• All links and icons are functional.
• Theme toggle (dark/light mode) works seamlessly with the new footer.

Are there any user-facing changes?

Yes. Users will now see a consistent footer section on the Sell Car page, improving navigation, accessibility, and the overall look and feel of the site.

[github-actions]

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• Ensure all file changes are correct.
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