Added the mail tag to the about.html file

[GauriBhandari]

🛠️ Fixes Issue

Issue - #1450

👨‍💻 Changes proposed

Added a clickable email link to the email address on the about page in about.html.

In this PR, I have modified the about.html file to include a clickable email link for the email address provided in the "contact@example.com" span. By using the mailto: URL scheme, users can now click on the email address, and it will open their default email client, allowing them to compose an email to the specified address.

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

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[rohanbabbar04]

Looks good :)

[GauriBhandari]

Thank you so much for merging my PR! I'm thrilled to see my contribution being a part of the project.