Add alt text to all figures for accessibility

[profvjreddi]

Currently, the figures in the repository lack descriptive alt text, which is essential for accessibility and inclusive documentation.

Request:

• Audit all figures and images in the repository.
• Add meaningful alt text to each figure to ensure compatibility with screen readers and to improve accessibility for visually impaired users.

Benefits:

• Enhances usability and compliance with accessibility standards.
• Improves overall quality of the documentation.