chore: add basic unit tests [7]

[nblenke]

adding jest, react-testing library and basic unit tests for home page/header/footer/menu to be expanded once i figure out how to log in :)

Description

Related Issue

Fixes #7

Testing

Run yarn test

Breaking Changes (if applicable)

Screenshots (if applicable)

Checklist:

• [ ] I have read and followed the CONTRIBUTING guidelines for this project.
• [ ] I have added or updated tests and they pass.
• [ ] I have added or updated documentation and it is accurate.
• [ ] I have noted any breaking changes in this module or downstream modules.

[fmorency]

Any idea why CI is failing @nblenke?

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