Issue/Create 404 page

[ntsummers1]

Title

Issue/Create 404 Page

Summary

This PR creates a 404 page incase the user navigates to the wrong place in the app

Fixes #19

Desktop

Mobile

Type of change

• [x] New feature (non-breaking change which adds functionality)

How To Test

1. run yarn dev, then navigate to localhost:3000/anything-you-want-here
2. See the snazy new 404 page.

Checklist:

• [x] My code follows the style guidelines of this project and has no linting errors
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas~
• ~[ ] I have made corresponding changes to the documentation, including any applicable ADRs~
• [x] My changes generate no new warnings
• [x] I have added tests that fail without these changes~
• [x] New and existing tests (unit, integration, accessibility) pass locally~
• ~[ ] Documentation updated~
• ~[ ] If there are security concerns they are addressed or ticketed after being discussed~

[codeclimate[bot]]

Code Climate has analyzed commit 18acb755 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

View more on Code Climate.