[DOCS]: Improvements to the app

[hangnguyenuser]

Is there an existing request for this change?

• I have searched the existing issues

Context for documentation change

Hi Julia,
I am new to open-source contributions and I came across your project. It is an awesome and meaningful idea and I would love to contribute to it. If possible, I would appreciate your guidance on how to contribute to this project.
Thank you in advance. I look forward to hearing from you soon.
Best,
Hang

Proposed solution

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Code of Conduct

• I've read the Code of Conduct and understand my responsibilities as a member of the if-me community

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[julianguyen]

Hey Hang! Happy to help find you a first issue!

This is a good first issue for writing unit tests in our React codebase: #2128