Fix: Added favicon to About us page (fixed #696)

[Zuhaib-01]

Description

Added favicon to About us page.

##Fixed issue: #696

Type of change

• Bug fix
• New feature
• Improvement
• Documentation update

How Has This Been Tested?

Navigated to About us page and checked it.

##Screenshot:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code where necessary
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation

[github-actions]

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