Fixed headings on Board page

[iNeso1984]

Description

Removed h1 and h2 headings from Board of Member cards and replaced with h4 and h5

Related Issue

https://github.com/Vets-Who-Code/vets-who-code-app/issues/358 ## Motivation and Context This change will improve accessibility reading. ## How Has This Been Tested? Chrome Dev Tools

Screenshots (if appropriate):

Types of changes

• [ ] 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:

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

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