feat: Testimonials updated

[DevNandini02]

Title and Issue number

Title : Testimonials Section Enhancement

Issue No. :#1061

Code Stack : HTML,CSS

Close #1061

Description

Added flipping card feature in testimonials section.

Video/Screenshots (mandatory)

https://github.com/user-attachments/assets/f4c2aadc-329b-466b-99d3-3002f78b316c

Type of PR

• [ ] Bug fix
• [x] Feature enhancement
• [ ] Documentation update
• [ ] Other (specify): ___

Checklist:

• [x] I have performed a self-review of my code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have tested the changes thoroughly before submitting this pull request.
• [x] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [x] I have gone through the contributing.md file before contributing

Are you contributing under any Open-source programme?

• [x] I am contributing under GSSOC'24
• [ ] I am contributing under VSOC'24

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