Feature/react router 404

[soph-em]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. Additionally, please include reasoning if tests have failed.

-Uses react router to route between pages. -Adds AdminDashboard.js page. -Adds testing to confirm which it pass, and resolved the tests that the routing changes failed.

Please select everything applicable. Please, do not delete any lines.

• [ ] 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 not work as expected)
• [ ] This change requires a documentation update
• [ ] This change requires an update to testing

Issue

• [x] Is this related to a specific issue? If so, please specify:
• Directly relates to #404
• Also indirectly closes #389 due to routing being updated

Checklist:

• [x] This PR is up to date with the main branch, and merge conflicts have been resolved
• [x] I have executed npm run test and all tests have passed successfully or I have included details within my PR on the failure.
• [x] I have executed npm run lint and resolved any outstanding errors. Most issues can be solved by executing npm run format
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings

[Caleb-Cohen]

This LGTM!