fix(a11y): reduced 94% and 50% of a11y issues on 'About Us' and 'Cont…

[StephNathai]

…ribute' pages respectively

Description

• adding underline to links + removing link color to make links a11y compliant on About Us and Contribute pages
• adding alt text to github member icons on About Us page to make these images a11y compliant

Fixes # 379

Type of Change:

• Code

Code/Quality Assurance Only

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• tested locally

Before Changes Screenshot

After Changes Screenshot

Checklist:

• [x ] My PR follows the style guidelines of this project
• [x ] I have performed a self-review of my own code or materials

Code/Quality Assurance Only

• [x ] My changes generate no new warnings
• [x ] New and existing unit tests pass locally with my changes

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