fix: Added dark-theme in testimonials

[VijaySamant4368]

Title and Issue number

Title : Added dark-theme in testimonials

Issue No. : #1056

Code Stack :

Close #1056

Description

Added dark-themes for the testimonials section that would go with dark-mode

Video/Screenshots (mandatory)

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Checklist:

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

Additional context:

##Are you contributing under any Open-source programme?

• I am contributing under GSSOC'24
• I am contributing under VSOC'24

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[github-actions]

Hi @VijaySamant4368! Thank you for your valuable contribution! Our team will review it and get back to you soon.

[VijaySamant4368]

@apu52 @itsekta please add the level tag.

[apu52]

@VijaySamant4368 good work