feat: Update About Section Content for Better Clarity and Engagement

[akshay0611]

Summary: This PR updates the content of the "About Youdemi" section to improve clarity, relevance, and user engagement. The changes aim to better communicate the platform's mission and value proposition.

Changes Made:

• Replaced the placeholder paragraph with meaningful content highlighting Youdemi's dedication to empowering learners through interactive courses.
• Updated the image alt text for better accessibility.
• Maintained the existing structure and styling.

Testing:

• Verified responsiveness across different screen sizes.
• Ensured alignment with existing CSS styles and framework conventions.

Related Issue: Closes #7