feat: Update Get Started Section Content for Better Relevance

[akshay0611]

Summary: This PR updates the content of the "Get started" section to improve clarity, relevance, and engagement. The changes aim to guide users through the car rental process effectively.

Changes Made:

• Rewrote the content of <p class="card-text"> for each step to provide meaningful and engaging descriptions.
• Ensured alignment with existing CSS styles and framework conventions.

Testing:

• Verified responsiveness across different screen sizes.
• Ensured proper rendering of the cards and their content.

Related Issue: Closes #3