Updated existing HTML page and added two new HTML pages

[raoshreya28]

Home Page Updates:
    Added new hyperlinks in the header section that direct users to about.html and contact.html pages for better site navigation and accessibility.

Contact Us Page (contact.html):
    Created a new contact form with fields for user input.
    Implemented a JavaScript alert that appears upon form submission to confirm that the form was submitted.

About Us Page (about.html):
    Developed a new page with a comprehensive description of the project.
    Included a button that links to the contact.html page, facilitating easier access to the contact form.

These modifications enhance user experience by providing clear navigation links and interactive elements on the site, helping users to easily find information and contact options