feat: faq changes - dark mode title

[saumyayadav25]

Title and Issue number

Title : FAQ dark-mode heading

Issue No. : #1638

Code Stack :

Close #1638

Description

In dark mode, title was not visible of faq,
also, the accordion icon was not visible clearly in any mode.

Video/Screenshots (mandatory)

Before:

After:

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 IEEE-IGDTUW Open Source Week 2024

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

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[apu52]

@saumyayadav25 good work thanks for your valuable contribution

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #1639 has been merged! 🎉🎉