feat: Update about section content for better relevance

[akshay0611]

Summary: This PR updates the content of the "About Us" section to improve clarity, relevance, and engagement. The changes aim to better communicate the value proposition of InnoHub as a digital marketing agency.

Changes Made:

• Rewrote the content of <p class="section-text"> for each subsection (About Us, Who We Are, Our Success, Our Mission).
• Updated list items under "Our Success" to highlight specific achievements.
• Improved the alt text for the banner image for better accessibility.
• Ensured alignment with existing CSS styles and framework conventions.

Testing:

• Verified responsiveness across different screen sizes.
• Ensured proper rendering of the about section and its content.

Related Issue: Closes #9