Make board member cards accessible via tab

[iNeso1984]

Made the Board of Members Cards under BoardCard.js file accessible via tab.

Description

Added tabindex=0 to BoardCards function to make the cards accessible via tab.

Related Issue

https://github.com/Vets-Who-Code/vets-who-code-app/issues/359

Motivation and Context

Improves accessibility.

How Has This Been Tested?

npm run test generated no errors.

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

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Name	Status	Preview	Updated
vets-who-code-app	✅ Ready (Inspect)	Visit Preview	Jul 18, 2022 at 7:10PM (UTC)