Add a link back to the home page from the 404 (not-found) page

[michaelsimeon001]

The not-found page should include a clear link/button back to the home page so users aren't stuck on a dead end.

Acceptance criteria

• Link/button to home page added on not-found.jsx
• Styling consistent with the rest of the app

[Leothosine]

Hi! I'd like to work on this issue. Could you please assign it to me? Thanks!