413 404 page

[zlrkw11]

closes #413

[zlrkw11]

• set up route in router
• auto directs to the last page clicked

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Visit the preview URL for this PR (updated for commit 80a7b53):

https://uasc-ceebc--pr422-413-404-page-tyn839w5.web.app

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[bcho892]

can we center this vertically? in this case its fine to use screen height

[zlrkw11]

• content centered vertically
• react-router implemented
• comments deleted

[zlrkw11]

• mobile viewport

[bcho892]

The image quality is very bad, can we use an svg instead?

[zlrkw11]

• new svg imported